{"id":5593,"date":"2026-09-21T02:47:47","date_gmt":"2026-09-21T02:47:47","guid":{"rendered":"https:\/\/www.henghuahose.com\/?p=5593"},"modified":"2026-09-21T02:47:49","modified_gmt":"2026-09-21T02:47:49","slug":"water-hose-types-sizes-materials-guide","status":"publish","type":"post","link":"https:\/\/www.henghuahose.com\/de\/water-hose-types-sizes-materials-guide\/","title":{"rendered":"Water Hose Types, Sizes and Materials: The Complete Guide"},"content":{"rendered":"<p>Water hose types are a combination of three specifications that are always chosen together: duty, size and material. By duty there are nine families \u2014 delivery, suction and discharge, washdown, potable, hot water, irrigation, lay-flat dewatering, fire service and garden. By pressure, ISO 1403 and ISO 6224 classify general-purpose water hose as Type 1 at 0.6 MPa (6 bar), Type 2 at 1.0 MPa (10 bar) and Type 3 at 2.5 MPa (25 bar). All three are rated at 23 \u00b0C.<\/p>\n\n\n\n<p>The three specifications constrain each other. Duty sets the construction; size sets the bore and the thread; material sets the temperature ceiling. The pressure class decides most of the rest, because pressure class and construction are linked: a higher class means more reinforcement layers and a thicker wall. Get all three right and an ordinary water hose runs for years; get one wrong and the same hose kinks, bursts or leaks inside a single season.<\/p>\n\n\n\n<p>This guide covers the full map of water hose families by duty and the standards that classify them. It also covers the sizes and threads that decide whether a hose actually fits, the material compounds and their temperature limits, and a selection matrix you can work through in order. It is written for buyers, maintenance engineers and specifiers who have to defend a specification on paper.<\/p>\n\n\n\n<p>Water hose material is set by the temperature ceiling first. The ceiling decides which compounds stay in the list: silicone 200 \u00b0C, EPDM 150 \u00b0C, TPE 100 \u00b0C, polyurethane 90 \u00b0C, SBR and natural rubber 80 \u00b0C, and PVC 60 \u00b0C.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-how-are-water-hose-types-defined\">1. How Are Water Hose Types Defined?<\/h2>\n\n\n\n<p>Four decisions define a water hose type, and each one constrains the others:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Duty<\/strong> sets the construction. A hose that only has to deliver water needs one reinforcement; a hose that has to pull water out of a tank or a pond needs a helical wire that stops the bore collapsing.<\/li>\n\n\n\n<li><strong>Pressure class<\/strong> sets the wall. This is where the Type 1, Type 2 and Type 3 classification in the water hose standards comes from, and it drives bore thickness and reinforcement.<\/li>\n\n\n\n<li><strong>Material<\/strong> sets the limits. The tube compound decides the temperature ceiling, the outdoor life and whether the hose can legally carry drinking water.<\/li>\n\n\n\n<li><strong>Size and thread<\/strong> set the connection. Bore controls flow; the thread standard controls whether the hose attaches to your pump, tap or camlock at all.<\/li>\n<\/ul>\n\n\n\n<p>Two hoses with the same bore and the same colour can sit in different pressure classes and in different temperature ranges. That is why a specification written as &#8220;1 inch water hose&#8221; is not a specification; it describes one of the four decisions and leaves the other three open.<\/p>\n\n\n\n<p>Table 1. The four decisions that define a water hose type, and what each one controls.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Decision<\/th><th scope=\"col\">What it controls<\/th><th scope=\"col\">Chosen from<\/th><th scope=\"col\">Consequence if wrong<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Duty<\/th><td>Reinforcement and collapse resistance<\/td><td>Delivery, suction, washdown, transfer, potable<\/td><td>Suction collapses a delivery hose flat<\/td><\/tr><tr><th scope=\"row\">Pressure class<\/th><td>Wall thickness and reinforcement layers<\/td><td>Type 1, Type 2 or Type 3 in the water hose standards<\/td><td>Burst at the weakest point, usually near a fitting<\/td><\/tr><tr><th scope=\"row\">Material<\/th><td>Temperature ceiling, weather life, approvals<\/td><td>EPDM, SBR, PVC, polyurethane, TPE or silicone<\/td><td>Cover cracking, tube swelling, failed potable approval<\/td><\/tr><tr><th scope=\"row\">Size and thread<\/th><td>Flow rate, pressure loss, connection<\/td><td>Nominal bore plus GHT, NPT, BSP or camlock<\/td><td>Poor flow, pump strain, leaking or cross-threaded joint<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-which-nine-water-hose-types-exist-by-duty\">2. Which Nine Water Hose Types Exist by Duty?<\/h2>\n\n\n\n<p>Duty is the first thing to fix, because it decides the construction. Nine duties cover almost everything sold as a water hose, and each one is built around a different failure it has to survive. The nine below are the industrial and commercial families. The garden and household hose varieties are catalogued there by what the hose is used for, while this guide organises the water hose types by the standard they are built to.<\/p>\n\n\n\n<p>A delivery hose pushes water and only has to resist internal pressure. A suction hose pulls water and has to resist atmospheric pressure crushing the bore, which is why it carries a helical wire and costs more for the same diameter. A washdown hose survives being dragged; a potable hose survives contact with drinking water; a hot water hose survives the temperature.<\/p>\n\n\n\n<p>The table below maps each duty to the standard that governs it and to the size range it is normally sold in. Where a duty has no dedicated international standard, the table says so rather than inventing one.<\/p>\n\n\n\n<p>Table 2. Water hose types by duty, with the governing specification and normal size range.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Duty<\/th><th scope=\"col\">Construction signature<\/th><th scope=\"col\">Governing specification<\/th><th scope=\"col\">Normal bore range<\/th><th scope=\"col\">What it must survive<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">General-purpose delivery<\/th><td>Textile-reinforced tube and cover<\/td><td>ISO 1403 (rubber), ISO 6224 (thermoplastic)<\/td><td>10 to 100 mm<\/td><td>Internal pressure, abrasion, weather<\/td><\/tr><tr><th scope=\"row\">Suction and discharge<\/th><td>Helical wire reinforcement (helix wire; a rigid spiral that resists collapse)<\/td><td>ISO 3994 (thermoplastic)<\/td><td>20 to 315 mm<\/td><td>Full vacuum, crushing, abrasive solids<\/td><\/tr><tr><th scope=\"row\">Washdown<\/th><td>Textile braid with abrasion-resistant cover<\/td><td>No single international standard; buyer and OEM specifications govern<\/td><td>12.7 to 25 mm<\/td><td>Dragging, oils, cleaning chemicals<\/td><\/tr><tr><th scope=\"row\">Potable water<\/th><td>Non-toxic tube, no leachable additives<\/td><td>NSF\/ANSI 61 and 372; FDA 21 CFR 177.2600<\/td><td>13 to 50 mm<\/td><td>Contact with drinking water, stagnation<\/td><\/tr><tr><th scope=\"row\">Hot water and steam<\/th><td>EPDM or silicone tube<\/td><td>No single international standard; compound datasheet governs<\/td><td>19 to 50 mm<\/td><td>Continuous heat, thermal cycling<\/td><\/tr><tr><th scope=\"row\">Agricultural irrigation<\/th><td>Light wall, UV-stabilised cover<\/td><td>ISO 1403 and ISO 6224 for the hose body<\/td><td>13 to 100 mm<\/td><td>Sun, fertiliser contact, ground dragging<\/td><\/tr><tr><th scope=\"row\">Lay-flat and dewatering<\/th><td>Flat-woven jacket, round under pressure<\/td><td>ISO 6224 for the thermoplastic body<\/td><td>25 to 300 mm<\/td><td>Rolling, folding, high flow<\/td><\/tr><tr><th scope=\"row\">Fire service<\/th><td>Heavy jacket, high burst margin<\/td><td>NFPA 1961 (North America); EN 14540 (fixed installations)<\/td><td>38 to 150 mm<\/td><td>Instant pressure rise, heat, abrasion<\/td><\/tr><tr><th scope=\"row\">Garden and household<\/th><td>Light tube, fibre braid, GHT couplings<\/td><td>Explicitly excluded from ISO 1403 and ISO 6224<\/td><td>12.7 to 19.1 mm<\/td><td>UV, kinking, repeated coiling<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Two of the nine duties sit outside the main water hose specifications. Consumer garden hose is the first: both ISO 1403 and ISO 6224 state that they do not cover consumer gardening hose, so a garden hose rating comes from the maker&#8217;s own data sheet. Washdown hose is the second, because cleaning duty is defined by the buyer rather than by a committee.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-1-why-delivery-and-suction-duty-cannot-be-swapped\">2.1 Why Delivery and Suction Duty Cannot Be Swapped<\/h3>\n\n\n\n<p>A delivery hose and a suction hose of identical bore are not interchangeable, and the reason is physical rather than commercial. A delivery hose resists pressure from inside, which pushes the wall outward and tightens the textile reinforcement. A suction hose is loaded from outside, and an unreinforced wall has almost no resistance to that direction of load.<\/p>\n\n\n\n<p>Practical consequences follow directly:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Put a delivery hose on a pump intake and the wall is loaded from outside, where it has almost no resistance. The bore closes, the pump runs dry within seconds, and the shaft seal is usually the first casualty.<\/li>\n\n\n\n<li>A suction hose used only for delivery is heavier, stiffer and typically rated at a lower internal pressure than a delivery hose of the same bore, because the helical wire does not carry hoop stress.<\/li>\n\n\n\n<li>Helical wire is not a pressure rating. It is a collapse rating, and the two numbers are printed separately on a compliant hose.<\/li>\n<\/ul>\n\n\n\n<p>If a line has to work both ways, specify a suction and discharge hose and read both ratings. Our <a href=\"https:\/\/www.henghuahose.com\/de\/suction-hose-vs-delivery-hose\/\" target=\"_blank\" rel=\"noopener\">suction hose versus delivery hose<\/a> comparison covers the distinction, and the <a href=\"https:\/\/www.henghuahose.com\/de\/product\/water-suction-hose-150psi-250psi\/\" target=\"_blank\" rel=\"noopener\">water suction hose range<\/a> lists rated vacuum constructions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-types-sizes-materials-guide-hero.jpg\" alt=\"Three water hoses side by side on a workshop floor, a green rubber garden hose with brass garden hose thread couplings, a blue textile-reinforced delivery hose, and a black helical wire suction hose with a camlock fitting\" class=\"wp-image-5579\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-types-sizes-materials-guide-hero.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-types-sizes-materials-guide-hero-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-types-sizes-materials-guide-hero-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-types-sizes-materials-guide-hero-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-types-sizes-materials-guide-hero-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 1. Three water hose constructions with the same nominal bore and three different reinforcement systems: a GHT garden hose, a textile-reinforced delivery hose, and a helical wire suction hose with a camlock coupling.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-what-standards-classify-water-hose-types\">3. What Standards Classify Water Hose Types?<\/h2>\n\n\n\n<p>Two international specifications cover the bulk of general-purpose water hose, and knowing which one applies tells you the pressure class, the temperature ceiling and the tests the hose has passed.<\/p>\n\n\n\n<p>ISO 1403 covers textile-reinforced rubber water hose. ISO 6224 covers the thermoplastic equivalent, meaning hose with a plastics lining and cover rather than a vulcanised rubber body. Both are also published as European standards, so a hose marked EN ISO 1403 or EN ISO 6224 carries the same requirements.<\/p>\n\n\n\n<p>Both standards sort hose into three types by maximum working pressure, and both state the pressure twice: once at 23 \u00b0C and once at 60 \u00b0C. That second figure matters more than buyers expect, because hot water reduces the wall&#8217;s strength and the rating falls with it.<\/p>\n\n\n\n<p>Table 3. Pressure classes in the two general-purpose water hose specifications, at 23 \u00b0C and at 60 \u00b0C.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Type<\/th><th scope=\"col\">Pressure class<\/th><th scope=\"col\">ISO 1403 (rubber) at 23 \u00b0C<\/th><th scope=\"col\">ISO 6224 (thermoplastic) at 23 \u00b0C<\/th><th scope=\"col\">Pressure at 60 \u00b0C<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Type 1<\/th><td>Low<\/td><td>0.6 MPa (6 bar)<\/td><td>0.6 MPa (6 bar)<\/td><td>0.36 MPa (3.6 bar)<\/td><\/tr><tr><th scope=\"row\">Type 2<\/th><td>Medium<\/td><td>1.0 MPa (10 bar)<\/td><td>1.0 MPa (10 bar)<\/td><td>0.65 MPa (6.5 bar)<\/td><\/tr><tr><th scope=\"row\">Type 3<\/th><td>High<\/td><td>2.5 MPa (25 bar)<\/td><td>2.5 MPa (25 bar)<\/td><td>1.6 MPa (16 bar)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>In imperial units the same three classes at 23 \u00b0C are about 87 psi, 145 psi and 363 psi, converted at 1 MPa = 145.04 psi.<\/p>\n\n\n\n<p>Scope boundary. ISO 1403 covers general-purpose water delivery, including water with additives that lower its freezing point. Drinking water, washing-machine inlets, firefighting, special agricultural machines and collapsible hose fall outside its scope. ISO 6224 draws nearly the same line and adds consumer gardening hose to the excluded group.<\/p>\n\n\n\n<p>The temperature envelope also differs by family. ISO 1403 rubber water hose is specified from \u221225 \u00b0C to +70 \u00b0C, with maximum working pressures up to 2.5 MPa. The thermoplastic hose in ISO 6224 is classified by pressure and rated to 60 \u00b0C. A hose chosen for a hot washdown line therefore belongs in the rubber family, not in the thermoplastic one.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-1-why-water-hose-is-tested-at-1-5-times-its-rating\">3.1 Why Water Hose Is Tested at 1.5 Times Its Rating<\/h3>\n\n\n\n<p>A water hose is proof tested above its rating and burst tested well above it, and the ratios come from a published scale rather than from a supplier&#8217;s judgement. ISO 7751 sets the proof pressure and minimum burst pressure as multiples of maximum working pressure for each category of hose service.<\/p>\n\n\n\n<p>For a water hose with a maximum working pressure at or below 1 MPa, the proof pressure ratio is 1.5 and the minimum burst ratio is 3.0. A higher-pressure liquid hose, above 1 MPa, moves to ratios of 2.0 and 4.0. The categories with more stored energy carry more margin, which is why the ratios climb for gases, for media that flash to vapour, and for steam.<\/p>\n\n\n\n<p>The practical reading is short: on a Type 2 water hose rated 1.0 MPa, the manufacturer&#8217;s proof test sits at 1.5 MPa and the hose must not burst below 3.0 MPa. Anything a supplier claims beyond that is extra margin, not a standard requirement.<\/p>\n\n\n\n<p>Table 4. Proof and minimum burst pressure ratios by hose service category.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Hose service category<\/th><th scope=\"col\">Proof pressure ratio<\/th><th scope=\"col\">Minimum burst ratio<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Water hose, maximum working pressure at or below 1 MPa<\/th><td>1.5<\/td><td>3.0<\/td><\/tr><tr><th scope=\"row\">Liquids, solids in liquids, or air above 1 MPa<\/th><td>2.0<\/td><td>4.0<\/td><\/tr><tr><th scope=\"row\">Compressed air and gases<\/th><td>2.0<\/td><td>4.0<\/td><\/tr><tr><th scope=\"row\">Media that vaporise on pressure reduction<\/th><td>2.5<\/td><td>5.0<\/td><\/tr><tr><th scope=\"row\">Steam<\/th><td>5.0<\/td><td>10.0<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The 1.5 factor in a compliant proof test is not a selection margin. It describes the pressure the manufacturer proof tests at, so a surge allowance has to be added on top of the maximum working pressure at the working temperature rather than taken from this ratio.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-how-do-you-read-water-hose-sizes-tolerances-and-threads\">4. How Do You Read Water Hose Sizes, Tolerances and Threads?<\/h2>\n\n\n\n<p>Water hose size is two specifications in one word, and confusing them causes most ordering errors. Bore, also called inner diameter, controls how much water the hose can move. The thread on the end fittings controls whether the hose connects to anything at all.<\/p>\n\n\n\n<p>A water hose size chart is only useful when it carries three things together: the nominal bore, the permitted tolerance window and the thread designation. The bore printed on a water hose is a nominal size, not a measured one.<\/p>\n\n\n\n<p>ISO 1307 defines the sizes of rubber and plastics hose, the minimum and maximum inside diameters permitted for each size, and the tolerances on cut-to-length hose. That means a compliant hose has a published window around the nominal figure, and a supplier who quotes a nominal bore without the window has quoted half a specification.<\/p>\n\n\n\n<p>Length is the fourth size variable and the one most often ignored. Every metre of hose adds friction, and friction removes pressure that the pump has already paid to create. A hose that is one size too small is a nuisance; a hose that is twice as long as it needs to be is a performance problem.<\/p>\n\n\n\n<p>An inside diameter quoted without a qualifier is ambiguous for the same reason, because the useful dimension is the one the water passes through, not the one you can measure with a tape across the outside. For the sizing workflow rather than the dimensions themselves, our <a href=\"https:\/\/www.henghuahose.com\/de\/hose-size-selection-guide\/\" target=\"_blank\" rel=\"noopener\">hose size selection guide<\/a> runs from the flow requirement down to the bore.<\/p>\n\n\n\n<p>Table 5. Water hose sizes with their metric equivalents, the duty each normally serves and the typical water hose pressure rating band. Bands apply to hose built to ISO 1403 or ISO 6224; garden hose is rated by the maker.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Nominal bore<\/th><th scope=\"col\">Inner diameter<\/th><th scope=\"col\">Normal duty<\/th><th scope=\"col\">Typical working pressure band<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">1\/2 in<\/th><td>12.7 mm<\/td><td>Garden, washdown guns, coolant lines<\/td><td>Up to 1.0 MPa (10 bar)<\/td><\/tr><tr><th scope=\"row\">5\/8 in<\/th><td>15.9 mm<\/td><td>Residential garden hose, light washdown<\/td><td>Up to 1.0 MPa (10 bar)<\/td><\/tr><tr><th scope=\"row\">3\/4 in<\/th><td>19.1 mm<\/td><td>High-flow garden, plant water supply<\/td><td>Up to 2.5 MPa (25 bar)<\/td><\/tr><tr><th scope=\"row\">1 in<\/th><td>25.4 mm<\/td><td>Pump discharge, transfer, irrigation<\/td><td>Up to 2.5 MPa (25 bar)<\/td><\/tr><tr><th scope=\"row\">1 1\/2 in<\/th><td>38.1 mm<\/td><td>Dewatering, agricultural delivery<\/td><td>Up to 2.5 MPa (25 bar)<\/td><\/tr><tr><th scope=\"row\">2 in<\/th><td>50.8 mm<\/td><td>Bulk transfer, suction and discharge<\/td><td>Up to 2.5 MPa (25 bar)<\/td><\/tr><tr><th scope=\"row\">3 in and above<\/th><td>76.2 mm and above<\/td><td>Dredging, high-volume dewatering, marine<\/td><td>Project-specific<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The conversion from inches to millimetres is the first place a specification goes wrong, because imperial bore is a nominal trade size rather than a decimal conversion. A half-inch hose is 12.7 mm exactly, but a 3\/4 inch hose is sold as 19 mm in metric markets and as 19.1 mm in catalogs. Keep one unit for the whole specification and use a conversion reference rather than mental arithmetic; our mm to inch hose conversion chart covers the full bore range.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-1-inner-diameter-tolerance-and-concentricity\">4.1 Inner Diameter Tolerance and Concentricity<\/h3>\n\n\n\n<p>Two dimensional properties decide whether a nominal bore behaves as designed: the tolerance band on the inside diameter and the concentricity between the bore and the outer cover.<\/p>\n\n\n\n<p>ISO 1403 states inside diameter tolerances that widen as the hose grows. The band runs from roughly \u00b10.75 mm on a 10 mm bore, through \u00b11.25 mm on a 25 mm bore, to \u00b12.00 mm at the top of the range. Concentricity is limited to 1.0 mm for bores up to 76 mm and 1.5 mm above that. The thermoplastic standard in ISO 6224 sets a concentricity tolerance of 1.0 mm.<\/p>\n\n\n\n<p>The permitted water hose diameter window is the part of the standard that a catalogue most often omits, and it is the part a receiver can actually verify. Concentricity is not a cosmetic number. A wall that is thin on one side fails there first, and a hose that is off-centre will not seal in a crimped coupling even when the bore is correct. It is also one of the few properties a buyer can check on arrival with a caliper and a straight edge.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-2-water-hose-thread-standards-ght-npt-bsp-and-camlock\">4.2 Water Hose Thread Standards: GHT, NPT, BSP and Camlock<\/h3>\n\n\n\n<p>Thread is where water hose types diverge most sharply between regions, and where the phrase &#8220;it fits but it leaks&#8221; originates. Four thread families cover nearly every water hose connection in use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Garden hose thread (GHT)<\/strong> is a parallel thread at 3\/4 inch and 11.5 threads per inch, designated 3\/4-11.5 NH under ASME B1.20.7, and it seals on a flat rubber washer rather than on the thread.<\/li>\n\n\n\n<li><strong>NPT<\/strong> is the North American tapered pipe thread, which seals by interference as the taper tightens and needs no washer.<\/li>\n\n\n\n<li><strong>BSP<\/strong> covers the European and Asian pipe threads: BSPP is parallel and seals on a bonded washer, BSPT is tapered and seals like NPT.<\/li>\n\n\n\n<li><strong>Camlock and quick couplings<\/strong> are not threaded at all; they lock on a cam arm or a ball detent and seal on a gasket.<\/li>\n<\/ul>\n\n\n\n<p>The ASME B1.20.7 hose coupling thread series also defines NPSH straight hose coupling threads for steam, air and general service from 1\/2 inch to 4 inch, and a spline-form NH thread for marine work.<\/p>\n\n\n\n<p>The practical rule for water hose is narrow. GHT appears on 1\/2 inch, 5\/8 inch and 3\/4 inch garden hose regardless of bore. Every other coupling is matched to the bore and to the region. Our hose thread size chart compares the designations side by side, and the 3\/4 inch GHT fitting guide covers garden hose measurement in detail.<\/p>\n\n\n\n<p>Using GHT against NPT is the single most common connection error, because both are close in diameter and neither will seal against the other. GHT is parallel and washer-sealed; NPT is tapered and self-sealing. Thread tape helps the second and does nothing useful for the first.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-size-measurement-id-od.jpg\" alt=\"A dimensioned side view of a water hose with the inner diameter marked along the bore, the wall thickness marked on the upper wall, and the outer diameter marked beyond the cut end\" class=\"wp-image-5580\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-size-measurement-id-od.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-size-measurement-id-od-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-size-measurement-id-od-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-size-measurement-id-od-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-size-measurement-id-od-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 2. Water hose size is measured on the bore, not across the outside: the same nominal size can carry different outer diameters and wall thicknesses.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-3-matching-water-hose-diameter-to-water-hose-fitting-size\">4.3 Matching Water Hose Diameter to Water Hose Fitting Size<\/h3>\n\n\n\n<p>Water hose diameter and water hose fitting size are two different measurements, and a specification that gives only one of them is incomplete. The diameter describes the bore that the water travels through; the fitting size describes the coupling, which follows a thread standard or a barb dimension rather than the bore.<\/p>\n\n\n\n<p>This is why a 1\/2 inch, a 5\/8 inch and a 3\/4 inch garden hose all accept the same coupling: the fitting size is set by the 3\/4-11.5 NH thread, not by the bore. The same split appears in industrial service. A 2 inch hose may be supplied with a 2 inch camlock, a flanged end or a threaded end, and each choice changes the assembly without changing the water hose diameter.<\/p>\n\n\n\n<p>A complete entry therefore carries the bore, the tolerance window, the water hose pressure rating and the fitting specification. Leave out the water hose pressure rating and the fitting decision becomes arbitrary, because a coupling must be rated at least as high as the hose it terminates. When you order, give the bore and the fitting size as separate items, and state the thread standard at each end.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"5-how-does-water-hose-size-change-flow-and-pressure-loss\">5. How Does Water Hose Size Change Flow and Pressure Loss?<\/h2>\n\n\n\n<p>Bore determines flow far more strongly than most buyers expect. Friction loss climbs steeply as flow rate rises and falls away very fast as the bore grows, so a small change in diameter buys a disproportionate change in delivered flow. Water hose sizes decide performance rather than fit, which is why a specification written by eye fails at the flow rate rather than at the coupling.<\/p>\n\n\n\n<p>Doubling the flow rate in the same hose multiplies the pressure loss by about 3.6; increasing the bore by a quarter cuts the loss by more than half.<\/p>\n\n\n\n<p>The table below is computed with the Hazen-Williams equation for a smooth reinforced bore, using a flow coefficient of 150, water at 20 \u00b0C, and a 50 ft (15.24 m) length. The figures are loss through the hose only: fittings, bends, nozzles and elevation add further loss on top.<\/p>\n\n\n\n<p>Table 6. Velocity and friction loss per 50 ft of hose, computed with Hazen-Williams at a flow coefficient of 150. Flow rates are 5, 10 and 20 GPM (19, 38 and 76 L\/min).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Nominal bore<\/th><th scope=\"col\">Velocity at 10 GPM<\/th><th scope=\"col\">Loss at 5 GPM<\/th><th scope=\"col\">Loss at 10 GPM<\/th><th scope=\"col\">Loss at 20 GPM<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">1\/2 in<\/th><td>4.98 m\/s (16.3 ft\/s)<\/td><td>12.2 psi<\/td><td>44.0 psi<\/td><td>159.0 psi<\/td><\/tr><tr><th scope=\"row\">5\/8 in<\/th><td>3.18 m\/s (10.4 ft\/s)<\/td><td>4.1 psi<\/td><td>14.7 psi<\/td><td>53.2 psi<\/td><\/tr><tr><th scope=\"row\">3\/4 in<\/th><td>2.20 m\/s (7.2 ft\/s)<\/td><td>1.7 psi<\/td><td>6.0 psi<\/td><td>21.8 psi<\/td><\/tr><tr><th scope=\"row\">1 in<\/th><td>1.25 m\/s<\/td><td>0.4 psi<\/td><td>1.5 psi<\/td><td>5.4 psi<\/td><\/tr><tr><th scope=\"row\">1 1\/2 in<\/th><td>0.55 m\/s<\/td><td>0.1 psi<\/td><td>0.2 psi<\/td><td>0.8 psi<\/td><\/tr><tr><th scope=\"row\">2 in<\/th><td>0.31 m\/s<\/td><td>0.0 psi<\/td><td>0.1 psi<\/td><td>0.2 psi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Velocity is the second number worth watching, and it is the one that rarely appears on a data sheet. Water velocity inside a hose is normally kept below about 3 m\/s to limit erosion, noise and water hammer. A 1\/2 inch water hose reaches 4.98 m\/s at 10 GPM, well above the 3 m\/s limit that keeps erosion and water hammer in check, which is a 3\/4 inch job being asked of a half-inch bore.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-1-worked-example-why-a-half-inch-hose-fails-at-fifty-feet\">5.1 Worked Example: Why a Half-Inch Hose Fails at Fifty Feet<\/h3>\n\n\n\n<p>A worked example makes the sizing rule concrete. Take a 50 ft hose fed at 50 psi, delivering 10 gallons per minute, and compare the three common garden bores:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>1\/2 inch at 10 GPM<\/strong> loses 44.0 psi over the 50 ft, leaving 6 psi at the outlet and pushing water through at 4.98 m\/s.<\/li>\n\n\n\n<li><strong>5\/8 inch at 10 GPM<\/strong> loses 14.7 psi, leaving 35 psi and running at 3.18 m\/s.<\/li>\n\n\n\n<li><strong>3\/4 inch at 10 GPM<\/strong> loses 6.0 psi, leaving 44 psi and running at 2.20 m\/s.<\/li>\n<\/ul>\n\n\n\n<p>The lesson is not that half-inch hose is bad. It is that flow rate has to be declared before a size is chosen. A 1\/2 inch hose is the right answer for 3 GPM short runs and the wrong answer for 10 GPM extended runs. Specify the flow, the length and the available pressure, and the bore selects itself; our water discharge hose range is built around that logic, with pressure classes matched to the delivery duty.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"6-what-water-hose-material-survives-your-duty-s-worst-condition\">6. What Water Hose Material Survives Your Duty&#8217;s Worst Condition?<\/h2>\n\n\n\n<p>Water hose material is chosen for the most extreme condition the tube will meet, not for the average one. A hose that carries cold water nine months of the year and hot washdown water in the tenth month has to be specified for the tenth month. A material name does not carry a pressure rating on its own: the same EPDM compound appears in 0.6 MPa and 2.5 MPa constructions, and the reinforcement is what separates them.<\/p>\n\n\n\n<p>Five compounds cover the great majority of water hose: EPDM, SBR, PVC, polyurethane and TPE. EPDM is the weatherproof and hot-water grade, SBR is the general-purpose rubber, PVC is the low-cost thermoplastic, polyurethane is the abrasion and cold-flexibility grade, and TPE covers the light rubber-like consumer products. Silicone appears where temperature or food contact justifies its cost.<\/p>\n\n\n\n<p>The temperature ranges below are the compound ratings we publish for our own production, and they are the figures to check a supplier&#8217;s claim against. A material with the right chemistry and the wrong temperature range still fails.<\/p>\n\n\n\n<p>Table 7. Water hose tube materials with temperature range, abrasion and weather performance.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Material<\/th><th scope=\"col\">Family<\/th><th scope=\"col\">Typical temperature range<\/th><th scope=\"col\">Abrasion<\/th><th scope=\"col\">Weather and ozone<\/th><th scope=\"col\">Water service note<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">EPDM<\/th><td>Elastomer<\/td><td>\u221250 \u00b0C to +150 \u00b0C<\/td><td>Good<\/td><td>Excellent<\/td><td>First choice for hot water and permanent outdoor lines<\/td><\/tr><tr><th scope=\"row\">Natural rubber and SBR<\/th><td>Elastomer<\/td><td>\u221250 \u00b0C to +80 \u00b0C<\/td><td>Excellent<\/td><td>Poor<\/td><td>Flexible and tough for cold water; needs a protective cover outdoors<\/td><\/tr><tr><th scope=\"row\">PVC<\/th><td>Thermoplastic<\/td><td>\u221210 \u00b0C to +60 \u00b0C<\/td><td>Fair<\/td><td>Fair<\/td><td>Lowest cost; stiffens in cold and plasticiser can migrate in hot water<\/td><\/tr><tr><th scope=\"row\">Polyurethane<\/th><td>Thermoplastic<\/td><td>\u221240 \u00b0C to +90 \u00b0C<\/td><td>Excellent<\/td><td>Good<\/td><td>Abrasion and cold-flexibility grade for washdown and dragging duty; not for continuous hot water.<\/td><\/tr><tr><th scope=\"row\">TPE and TPR<\/th><td>Thermoplastic elastomer<\/td><td>\u221240 \u00b0C to +100 \u00b0C<\/td><td>Good<\/td><td>Good<\/td><td>Light consumer hose with rubber-like feel; low pressure service only<\/td><\/tr><tr><th scope=\"row\">Silicone<\/th><td>Elastomer<\/td><td>\u221260 \u00b0C to +200 \u00b0C<\/td><td>Poor<\/td><td>Excellent<\/td><td>Highest heat range; low abrasion, so route it away from sharp edges<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Read this table twice. The temperature figures are continuous-service limits for the tube compound rather than short-term peaks, so a hose that sees a hotter surge than its ceiling ages measurably faster. The abrasion and weather columns are relative rankings within this table, not measured values, so a specification that has to defend abrasion life should ask the compound datasheet for a measured figure.<\/p>\n\n\n\n<p>Two failure mechanisms explain most material-related complaints, and both are chemistry rather than manufacturing defects. PVC loses plasticiser over time, which is why a vinyl hose that was flexible when new becomes rigid and eventually cracks; the rate rises with temperature, so hot water accelerates it. Natural rubber and SBR have unsaturated backbones that ozone attacks, which is why an unprotected rubber cover develops fine surface cracks after a summer in direct sun.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-material-temperature-range-chart.jpg\" alt=\"A horizontal bar chart of water hose material temperature ranges, with bars for silicone, EPDM, TPE, polyurethane, natural rubber and SBR, and PVC against a Celsius axis from minus 60 to plus 200\" class=\"wp-image-5581\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-material-temperature-range-chart.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-material-temperature-range-chart-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-material-temperature-range-chart-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-material-temperature-range-chart-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-material-temperature-range-chart-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 3. Material temperature envelopes for water hose: the ceiling, not the average condition, decides which compound is eligible.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-1-drinking-water-service-the-approvals-that-decide-it\">6.1 Drinking Water Service: The Approvals That Decide It<\/h3>\n\n\n\n<p>Drinking water is the one water service where material choice is a legal question rather than an engineering preference. A hose carrying potable water has to be made from compounds that do not leach into the water, and the approvals are granted to specific compounds rather than to a material family in general.<\/p>\n\n\n\n<p>Three approvals are quoted most often in potable water hose specifications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>NSF\/ANSI 61<\/strong> covers the health effects of materials that contact drinking water, and the related NSF\/ANSI 372 limits lead content in wetted components.<\/li>\n\n\n\n<li><strong>FDA 21 CFR 177.2600<\/strong> defines the rubber articles intended for repeated use in contact with food, which is the reference for elastomer hoses in food and beverage duty.<\/li>\n\n\n\n<li><strong>EU Regulation 10\/2011<\/strong> applies to plastics in food contact in the European market, and it is the reference used for thermoplastic potable hose.<\/li>\n<\/ul>\n\n\n\n<p>In practice the boundary is what decides the specification. Potable service needs a compound certified to NSF\/ANSI 61, and ISO 1403 and ISO 6224 both place drinking water outside their scope, so a Type 2 water hose is a water hose and not a potable hose.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-2-hot-water-service-which-compounds-survive-above-60-c\">6.2 Hot Water Service: Which Compounds Survive Above 60 \u00b0C<\/h3>\n\n\n\n<p>Hot water separates the material list faster than any other condition. In the hot-water case the rating falls with the same chemistry that sets the ceiling: a Type 3 water hose rated 2.5 MPa at 23 \u00b0C is rated 1.6 MPa at 60 \u00b0C. Choose the class at the water temperature the hose will actually see, not at ambient.<\/p>\n\n\n\n<p>EPDM is the practical answer for most hot water service to 150 \u00b0C. It also resists the ozone and UV that destroy rubber covers outdoors, which is why the same compound appears in both hot-water lines and permanent garden installations. Silicone extends the ceiling to about 200 \u00b0C with a soft tube, and it is the choice where heat is extreme and abrasion is not a factor.<\/p>\n\n\n\n<p>For hot water above roughly 60 \u00b0C the eligible compounds are EPDM to 150 \u00b0C and silicone above that. PVC leaves the list at its own 60 \u00b0C envelope limit, and polyurethane keeps a 90 \u00b0C envelope but is bought for cold flexibility and abrasion rather than for continuous hot water.<\/p>\n\n\n\n<p>For comparisons across the full material list, our <a href=\"https:\/\/www.henghuahose.com\/de\/flexible-hose-materials-guide\/\" target=\"_blank\" rel=\"noopener\">flexible hose materials guide<\/a> covers the ten common hose polymers, including their oil, chemical and food-contact behaviour. The PVC vs rubber garden hose comparison works through the same trade-off for outdoor watering specifically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"7-water-hose-construction-tube-reinforcement-and-cover\">7. Water Hose Construction: Tube, Reinforcement and Cover<\/h2>\n\n\n\n<p>A water hose is a flexible reinforced tube that carries water and non-corrosive fluids at low to medium pressure, and its tube, reinforcement and cover are chosen for that service rather than for oil-based fluid power. Fluid-power hose is a different family, specified against different standards.<\/p>\n\n\n\n<p>Construction is what turns a material into a pressure rating. Every reinforced water hose has three layers, and each one has one job.<\/p>\n\n\n\n<p>The tube carries the fluid and sets chemical compatibility. The reinforcement carries the pressure or resists collapse, and it is the layer that changes when the pressure class changes. The cover protects the reinforcement from abrasion, sunlight and chemicals, and it is usually the layer that decides how long the hose survives on site.<\/p>\n\n\n\n<p>Reinforcement comes in three forms, and the choice is driven by the load direction rather than by cost alone:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Textile braid or plait<\/strong> carries internal pressure and gives the tube a round, kink-resistant shape; it is the standard reinforcement for delivery hose in ISO 1403 and ISO 6224.<\/li>\n\n\n\n<li><strong>Helical wire<\/strong> resists external pressure and stops the bore collapsing under vacuum; it is required for suction duty and is combined with textile in suction and discharge hose.<\/li>\n\n\n\n<li><strong>Steel wire braid<\/strong> carries very high internal pressure and appears in hydraulic and high-pressure waterblast hose rather than in general water service.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-construction-tube-reinforcement-cover.jpg\" alt=\"A cutaway cross section of a reinforced water hose showing the inner tube, two layers of textile braid reinforcement and the outer cover, beside a suction hose with a helical wire\" class=\"wp-image-5582\" srcset=\"https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-construction-tube-reinforcement-cover.jpg 800w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-construction-tube-reinforcement-cover-300x225.jpg 300w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-construction-tube-reinforcement-cover-768x576.jpg 768w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-construction-tube-reinforcement-cover-16x12.jpg 16w, https:\/\/www.henghuahose.com\/wp-content\/uploads\/2026\/09\/water-hose-construction-tube-reinforcement-cover-600x450.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Figure 4. The three layers of a reinforced water hose, and the helical wire that separates a suction hose from a delivery hose.<\/p>\n\n\n\n<p>A fourth element matters on large diameter and high-pressure hose: the adhesion between layers. A hose whose cover separates from the reinforcement will fail from the inside at a bend, long before the tube shows wear. Adhesion between components is a tested property, not an assumption, and it is one of the reasons two hoses that look identical on the outside can carry different ratings.<\/p>\n\n\n\n<p>Table 8. Water hose reinforcement types against the load each one carries.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Reinforcement<\/th><th scope=\"col\">Load carried<\/th><th scope=\"col\">Typical duty<\/th><th scope=\"col\">Effect on the hose<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Textile braid or plait<\/th><td>Internal pressure<\/td><td>Delivery, irrigation, washdown<\/td><td>Raises burst strength, resists kinking, stays flexible<\/td><\/tr><tr><th scope=\"row\">Helical wire<\/th><td>External pressure<\/td><td>Suction, suction and discharge<\/td><td>Prevents collapse, adds weight and reduces flexibility<\/td><\/tr><tr><th scope=\"row\">Steel wire braid<\/th><td>Very high internal pressure<\/td><td>High-pressure waterblast, hydraulic<\/td><td>Very high rating, stiff, needs a protective cover<\/td><\/tr><tr><th scope=\"row\">Cover compound<\/th><td>None; protective<\/td><td>All outdoor and abrasive duty<\/td><td>Sets ozone, UV, oil and abrasion life<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Couplings are the fourth component of an assembly, and they are where most field failures start. A hose assembly is only as strong as the joint between the hose and the fitting, and the joint is decided by the coupling type and the attachment method rather than by the hose rating. Our hose coupling guide covers the attachment options in detail.<\/p>\n\n\n\n<p>Construction, not bore, separates an industrial water hose from a consumer hose of the same size. An industrial water hose carries a stated duty and pressure class, while a consumer hose is sold by convenience and length. That difference is not visible from the outside, which is why two hoses of the same nominal bore can carry ratings that differ by a factor of four.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"8-how-do-you-choose-between-water-hose-types\">8. How Do You Choose Between Water Hose Types?<\/h2>\n\n\n\n<p>Selection is easier when it runs in a fixed order, because each step removes options rather than adding them. Work from the fluid, then the duty, then the temperature, then the pressure, and leave size and thread for last.<\/p>\n\n\n\n<p>The order matters because temperature disqualifies more candidates than any other condition, and duty disqualifies the second largest group. A buyer who starts with price ends up comparing hoses that were never eligible:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Step 1, fluid.<\/strong> If the water is for drinking, the hose must carry an NSF\/ANSI 61 certification and the rest of the list is filtered automatically.<\/li>\n\n\n\n<li><strong>Step 2, duty.<\/strong> Ask whether the line pushes or pulls. Push selects a delivery hose; pull selects a water suction hose; a line that does both selects a suction and discharge construction.<\/li>\n\n\n\n<li><strong>Step 3, temperature.<\/strong> Continuous temperature at the hose, not at the pump, decides between thermoplastic and rubber. Above roughly 60 \u00b0C the continuous-hot-water duty is specified in a rubber or silicone hose rather than in a thermoplastic one.<\/li>\n\n\n\n<li><strong>Step 4, pressure.<\/strong> Add the pump&#8217;s maximum discharge pressure to the surge allowance, then choose a Type 1, Type 2 or Type 3 class that covers the total.<\/li>\n\n\n\n<li><strong>Step 5, size and thread.<\/strong> Size the bore from the required flow and run length using the friction table, then match the thread standard at both ends.<\/li>\n<\/ul>\n\n\n\n<p>Table 9. Selection matrix for common water hose duties.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th scope=\"col\">Application<\/th><th scope=\"col\">Recommended type<\/th><th scope=\"col\">Recommended material<\/th><th scope=\"col\">Pressure class to specify<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Filling an RV, boat or food-plant tank<\/th><td>Potable water hose<\/td><td>NSF\/ANSI 61 certified compound<\/td><td>Type 1 or Type 2, whatever the supply needs<\/td><\/tr><tr><th scope=\"row\">Watering a garden or a yard<\/th><td>Garden hose with GHT couplings<\/td><td>EPDM rubber or TPE<\/td><td>Maker&#8217;s rating; garden hose sits outside ISO 1403 and ISO 6224<\/td><\/tr><tr><th scope=\"row\">Washing down a plant floor or a vehicle<\/th><td>Washdown hose with abrasion-resistant cover<\/td><td>Polyurethane or EPDM<\/td><td>Type 2 or Type 3<\/td><\/tr><tr><th scope=\"row\">Dewatering a site or a sump<\/th><td>Delivery or lay-flat discharge hose<\/td><td>PVC or SBR<\/td><td>Type 2<\/td><\/tr><tr><th scope=\"row\">Drawing water from a tank or a pond<\/th><td>Suction and discharge hose with helical wire<\/td><td>SBR or EPDM with helical wire<\/td><td>Type 2 or Type 3, plus a stated vacuum rating<\/td><\/tr><tr><th scope=\"row\">Hot water washdown or boiler drain-down<\/th><td>Hot water hose<\/td><td>EPDM to 150 \u00b0C, silicone above<\/td><td>Type 2 or Type 3 rated at 60 \u00b0C, not at 23 \u00b0C<\/td><\/tr><tr><th scope=\"row\">Irrigating a field or a greenhouse<\/th><td>Agricultural delivery hose<\/td><td>PVC with UV-stabilised cover<\/td><td>Type 1 or Type 2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Two figures decide more field failures than any other: whether the line is under suction, and the maximum continuous water temperature rather than the ambient temperature. A supplier who receives those two figures plus the flow rate can size the hose without guessing. For the joint itself, the hose clamp selection guide covers clamp types, materials and torque values. If the five steps have narrowed the type and the material, the water hose range is organised around the same duties.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"9-where-water-hose-types-fail-five-field-failure-modes\">9. Where Water Hose Types Fail: Five Field Failure Modes<\/h2>\n\n\n\n<p>Water hose failures are repetitive. Five mechanisms account for the large majority of returned and replaced hose, and each one points at a different decision made earlier in the specification:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Kinking and permanent creasing.<\/strong> Thin-walled, unreinforced hose collapses at a tight bend and takes a set. The fix is a textile-reinforced construction, a larger bend radius, or a shorter run.<\/li>\n\n\n\n<li><strong>Cover cracking and embrittlement.<\/strong> Ozone and ultraviolet light break down unsaturated rubber covers and plasticised PVC. The fix is an EPDM cover, shade, or storage out of direct sun.<\/li>\n\n\n\n<li><strong>Collapse under suction.<\/strong> A delivery hose on a pump intake flattens along its length and starves the pump. The fix is a helical wire reinforced hose with a stated collapse rating for full vacuum.<\/li>\n\n\n\n<li><strong>Fitting pull-off and weeping joints.<\/strong> The coupling, not the tube, is usually the weakest element of an assembly. The fix is a matched hose and fitting system and a documented crimp or clamp specification.<\/li>\n\n\n\n<li><strong>Freeze splitting.<\/strong> Water expands as it freezes and splits walls and couplings from the inside. The fix is draining, disconnecting and indoor storage before the first frost.<\/li>\n<\/ul>\n\n\n\n<p>A distinction matters here. Kinking and freeze damage are installation and storage problems, and they are recovered by changing how the hose is used. Cover cracking, tube swelling and fitting pull-off are specification problems, and no amount of care will recover them, because the hose was the wrong part from the day it was ordered.<\/p>\n\n\n\n<p>Two related duties deserve separate mention because both are specified by the machine rather than by the water line. A washdown hose is rated for cleaning duty with an abrasion-resistant cover, and our washdown hose range is built for that service. A pressure washer hose is rated to the machine&#8217;s own maximum pressure, which is a different order of magnitude; the pressure washer hose guide covers how to match one to a machine.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"10-water-hose-care-storage-and-service-life\">10. Water Hose Care, Storage and Service Life<\/h2>\n\n\n\n<p>Care extends service life more than price does. A mid-range hose that is drained, shaded and stored correctly outlives a premium hose that is left pressurised in the sun. ISO 8331 exists precisely to describe that discipline: it sets out recommendations for selecting, storing, using and maintaining rubber and plastics hoses and hose assemblies.<\/p>\n\n\n\n<p>Storage decisions carry the most weight, because most of a hose&#8217;s calendar life is spent off the line. Four rules capture the standard&#8217;s intent in practical form:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Drain before storage.<\/strong> Residual water freezes in winter and stagnates in summer, and a pressurised hose keeps its reinforcement under permanent load.<\/li>\n\n\n\n<li><strong>Store out of direct sunlight.<\/strong> Ultraviolet light attacks covers, and ozone concentrations are highest around electrical equipment, so keep hose away from motors and switchgear.<\/li>\n\n\n\n<li><strong>Coil in wide loops, never tight.<\/strong> Coiling over a hook at a small radius creates a set that becomes a kink on the next use.<\/li>\n\n\n\n<li><strong>Support long lengths.<\/strong> A hose hanging from a single point concentrates stress at one bend and creates a permanent flat spot there.<\/li>\n<\/ul>\n\n\n\n<p>Inspection is the other half. Before each season, work through four checks:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Look for cracks and blisters on the cover, and feel the wall for soft or swollen sections.<\/li>\n\n\n\n<li>Examine the last 150 mm at each coupling, where bulging and weeping appear first.<\/li>\n\n\n\n<li>Confirm that the printed marking is still legible.<\/li>\n\n\n\n<li>Read the marking for the reference standard, hose type, bore, maximum working pressure and quarter and year of manufacture, which is exactly the information needed to reorder the same hose.<\/li>\n<\/ul>\n\n\n\n<p>Three findings retire a hose without further testing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A bulge or a weep at either coupling.<\/li>\n\n\n\n<li>A cover crack that reaches the reinforcement.<\/li>\n\n\n\n<li>A soft or swollen section that does not recover once the line is depressurised.<\/li>\n<\/ul>\n\n\n\n<p>Each one means the wall has already lost its load path at that point, so the hose is replaced rather than repaired.<\/p>\n\n\n\n<p>Service life then follows material and duty rather than a fixed number. A permanently installed EPDM line in shade will outlast a portable PVC hose used on abrasive ground by a wide margin. The honest answer to how long a water hose lasts is that the cover and the couplings usually retire a hose long before the tube does.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"11-frequently-asked-questions\">11. Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-are-the-main-water-hose-types\">What are the main water hose types?<\/h3>\n\n\n\n<p>The main water hose families by duty are delivery, suction and discharge, washdown, potable, hot water, agricultural irrigation, lay-flat dewatering, fire service and garden hose. Each duty is recognised by what it must survive. Delivery hose carries internal pressure, suction and discharge hose adds a helical wire against collapse, washdown hose carries an abrasion-resistant cover, potable hose is built from a certified compound, and hot water hose from EPDM or silicone.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-i-read-a-water-hose-size-chart\">How do I read a water hose size chart?<\/h3>\n\n\n\n<p>Read it in the order the receiving check runs: thread designation first, then the permitted inner diameter window, then the nominal bore. The thread decides whether the hose connects at all, and the window tells a receiver what to accept. The nominal bore is the trade name the catalogue sells, so a water hose size chart with only the third column has sent half a specification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-are-the-standard-water-hose-sizes\">What are the standard water hose sizes?<\/h3>\n\n\n\n<p>There is no single standard water hose size, because size is chosen from the flow requirement. The common nominal bores are 1\/2 inch at 12.7 mm, 5\/8 inch at 15.9 mm, 3\/4 inch at 19.1 mm and 1 inch at 25.4 mm, with industrial hose continuing to 100 mm and beyond. ISO 1307 sets the permitted inner diameter window around each nominal size.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"is-a-bigger-water-hose-always-better\">Is a bigger water hose always better?<\/h3>\n\n\n\n<p>No. A larger bore always reduces friction loss, but it also adds weight, reduces flexibility and costs more per metre. Oversizing a short, low-flow line gains nothing measurable, while undersizing a long line can consume almost all of the available pressure. Size from the flow rate and the run length rather than from the preference for the largest bore available.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-water-hose-material-lasts-longest-outdoors\">What water hose material lasts longest outdoors?<\/h3>\n\n\n\n<p>EPDM has the best outdoor life of the common hose materials, because its saturated polymer backbone resists ozone, ultraviolet light and oxidation, and it is rated from \u221250 \u00b0C to +150 \u00b0C. PVC costs less but embrittles in sunlight and stiffens below about \u221210 \u00b0C. For a hose that stays outside all year, EPDM is normally the better value across its life.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-water-hose-is-safe-for-drinking-water\">What water hose is safe for drinking water?<\/h3>\n\n\n\n<p>Use a potable water hose made from a compound certified to NSF\/ANSI 61, with lead content limited under NSF\/ANSI 372, and for elastomer hose a compound meeting FDA 21 CFR 177.2600. Crucially, ISO 1403 and ISO 6224 both exclude drinking water from their scope, so a correctly rated Type 2 water hose is still not approved for potable service.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-water-hose-material-handles-hot-water\">What water hose material handles hot water?<\/h3>\n\n\n\n<p>EPDM is the practical choice for hot water up to about 150 \u00b0C, and silicone extends the range to roughly 200 \u00b0C where abrasion is not a concern. PVC is limited to about 60 \u00b0C and loses flexibility as it ages. Polyurethane is rated to 90 \u00b0C in Table 7, but its duty is abrasion and cold flexibility rather than heat, so continuous hot water is specified in EPDM or silicone. Note that a thermoplastic hose rated 1.0 MPa at 23 \u00b0C is typically rated only 0.65 MPa at 60 \u00b0C.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-water-hose-pressure-rating-do-i-need\">What water hose pressure rating do I need?<\/h3>\n\n\n\n<p>Add the pump&#8217;s maximum discharge pressure to the surge allowance you expect from valve closure, then choose a class that covers the total at the maximum water temperature, not at ambient. In the general-purpose water hose standards that means Type 1 at 0.6 MPa, Type 2 at 1.0 MPa or Type 3 at 2.5 MPa at 23 \u00b0C.<\/p>\n\n\n\n<p>A water hose pressure rating read at 23 \u00b0C is not the rating that applies at 60 \u00b0C, where the same hose is typically rated 35 to 40 percent lower. In imperial units that rating is about 145 psi at 23 \u00b0C and about 94 psi at 60 \u00b0C.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"why-does-my-water-hose-lose-pressure-over-a-long-run\">Why does my water hose lose pressure over a long run?<\/h3>\n\n\n\n<p>Friction between the water and the hose bore consumes pressure, and the loss rises roughly with the 1.85 power of flow rate while falling with the 4.87 power of diameter. Over 50 ft at 10 GPM, a 1\/2 inch hose loses about 44 psi while a 3\/4 inch hose loses about 6 psi. Long runs therefore need a larger bore rather than a higher pump setting.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-happens-if-the-bore-and-the-fitting-size-disagree\">What happens if the bore and the fitting size disagree?<\/h3>\n\n\n\n<p>Nothing is faulty: the bore and the water hose fitting size are independent measurements, and the coupling follows the thread standard rather than the bore. In industrial service the coupling must be rated at least as high as the hose it terminates, so give both figures separately and add an adapter where the thread standards at the two ends differ.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-difference-between-a-water-hose-and-a-hydraulic-hose\">What is the difference between a water hose and a hydraulic hose?<\/h3>\n\n\n\n<p>A water hose is built for water service at low to medium pressure, governed by ISO 1403 and ISO 6224, and it is not designed for oil. A hydraulic hose is built for oil-based fluid power at far higher pressure, with steel or textile reinforcement matched to impulse cycling. The two are not interchangeable in either direction.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"can-a-delivery-hose-be-used-for-suction\">Can a delivery hose be used for suction?<\/h3>\n\n\n\n<p>No. A delivery hose resists internal pressure but has almost no resistance to external pressure. Under suction it flattens along its length and starves the pump, so suction duty always takes a water suction hose with a stated collapse rating rather than a pressure rating.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-i-stop-a-water-hose-from-leaking-at-the-coupling\">How do I stop a water hose from leaking at the coupling?<\/h3>\n\n\n\n<p>Identify the thread standard first, because a garden hose thread coupling seals on a flat rubber washer while a tapered pipe thread seals on the taper itself. Replace the washer in a GHT coupling, check that GHT is not mated to NPT, and verify the clamp or crimp at a barbed joint. Most connection leaks are one of those three causes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"do-the-different-hose-types-need-different-storage\">Do the different hose types need different storage?<\/h3>\n\n\n\n<p>The storage rules are the same across types: drain the hose, keep it out of direct sunlight, coil it in wide loops and avoid hanging it from a single point. What changes is tolerance. A thin-walled thermoplastic hose takes a permanent set from tight coiling far more readily than a reinforced rubber hose, so it needs the wider loop.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-do-i-write-a-water-hose-specification-for-a-supplier\">How do I write a water hose specification for a supplier?<\/h3>\n\n\n\n<p>State five items: the fluid and whether it is potable, the required flow rate, the maximum continuous water temperature, the maximum system pressure including surge, and whether the line is under suction. Add the bore, the length and the thread standard at each end. Those eight figures remove almost every assumption a supplier would otherwise have to make. Send those figures to our <a href=\"https:\/\/www.henghuahose.com\/de\/contact\/\" target=\"_blank\" rel=\"noopener\">engineering team<\/a> and the reply comes back as a type, a material and a coupling rather than a list of options.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-am-filling-a-food-plant-tank-from-a-municipal-tap-which-water-hose-do-i-need\">I am filling a food-plant tank from a municipal tap \u2014 which water hose do I need?<\/h3>\n\n\n\n<p>Potable duty decides the hose before any other figure does. Start from the approval carried by the tube compound, not from the product name, because the certifications are granted to compounds and not to brands. Set the pressure class from the supply pressure next, and check that the coupling is rated at least as high as the hose it terminates.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"my-roof-garden-hose-splits-every-winter-should-i-change-material-or-change-how-i-store-it\">My roof-garden hose splits every winter. Should I change material or change how I store it?<\/h3>\n\n\n\n<p>Change how you store it first, because freeze splitting is an installation problem rather than a material one: drain the hose, disconnect it from the tap and store it indoors before the first frost. Where a line has to stay outside all year, an EPDM hose has the longest weather and ozone life of the common compounds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"my-pump-sits-20-m-from-the-field-how-do-i-size-the-hose-so-the-outlet-pressure-still-works\">My pump sits 20 m from the field. How do I size the hose so the outlet pressure still works?<\/h3>\n\n\n\n<p>Read the flow rate, the available pressure and the run length together, and let the bore follow from those three figures. Table 6 gives the loss per 50 ft (15.24 m) at three flow rates, so read the row for each bore you are considering and scale it to your own run before you compare. Keep velocity below about 3 m\/s, then match the thread standard at both ends.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"12-getting-the-right-water-hose-for-your-application\">12. Getting the Right Water Hose for Your Application<\/h2>\n\n\n\n<p>The decisions that define water hose types map directly onto three figures a supplier needs: the flow rate, the maximum continuous temperature, and the maximum pressure including surge. Send those three plus the bore, the length, the thread standard and whether the line is under suction, and the specification becomes a calculation rather than a conversation.<\/p>\n\n\n\n<p>HENGHUA manufactures water hose for irrigation, construction, industrial washdown, agriculture and general transfer duty, supplying distributors, OEMs and fleet operators worldwide. The range covers both the rubber and the thermoplastic routes for water hose, from 10 mm to 100 mm bore. It also covers helical wire suction and discharge hose for full vacuum duty, lay-flat dewatering hose in large diameters, and potable constructions built on certified compounds.<\/p>\n\n\n\n<p>Because compounding, extrusion, reinforcement, covering and testing are handled in house, we can match a hose to a stated duty rather than to the nearest catalogue item. Pressure class, cover compound, coupling type and length are all settable against the application, and every assembly is pressure tested before shipment with production records traceable to the batch. Where a hose has failed in the field, we can review the returned sample and identify whether the correct fix belongs in the compound, the pressure class, the routing or the system settings.<\/p>\n\n\n\n<p>If you are specifying a water hose for a new line, or replacing a hose that keeps failing, send us five figures: flow rate, maximum continuous water temperature, working pressure, bore and suction condition.<\/p>\n\n\n\n<p>If you are checking whether a compound you already buy is rated for drinking water or for hot service, send that question too. Our engineering team will confirm the type, the material and the couplings, and our industrial water hose range shows the constructions available for each duty. Contact our engineering team for a matched recommendation, or read about HENGHUA if you need our production and quality records before a first order.<\/p>\n\n\n\n<p><strong>About the author.<\/strong> This guide was prepared by the HENGHUA water hose applications engineering team, which specifies reinforced rubber and thermoplastic water hose for irrigation, construction, agriculture and industrial washdown customers. The pressure classes, temperature ranges and dimensional limits quoted here are taken from the published specifications named in the list below and from our own compound and quality-control records.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"13-standards-referenced-in-this-guide\">13. Standards Referenced in This Guide<\/h2>\n\n\n\n<p>No hose designation should be accepted without the standard behind it. The specifications below are the ones this guide relies on, listed by designation and scope so a buyer can ask for the right document:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ISO 1307<\/strong> \u2014 rubber and plastics hoses: hose sizes, minimum and maximum inside diameters, and tolerances on cut-to-length hoses.<\/li>\n\n\n\n<li><strong>ISO 1403<\/strong> \u2014 rubber hoses, textile-reinforced, for general-purpose water applications: specification, three types, \u221225 \u00b0C to +70 \u00b0C.<\/li>\n\n\n\n<li><strong>ISO 6224<\/strong> \u2014 thermoplastics hoses, textile-reinforced, for general-purpose water applications: specification, three pressure types.<\/li>\n\n\n\n<li><strong>ISO 3994<\/strong> \u2014 plastics hoses, helical-thermoplastic-reinforced, for suction and discharge of aqueous materials: specification.<\/li>\n\n\n\n<li><strong>ISO 7751<\/strong> \u2014 rubber and plastics hoses and hose assemblies: ratios of proof and burst pressure to maximum working pressure.<\/li>\n\n\n\n<li><strong>ISO 1402<\/strong> \u2014 rubber and plastics hoses and hose assemblies: hydrostatic testing.<\/li>\n\n\n\n<li><strong>ISO 4671<\/strong> \u2014 rubber and plastics hoses and hose assemblies: methods of measurement of dimensions and lengths.<\/li>\n\n\n\n<li><strong>ISO 8331<\/strong> \u2014 rubber and plastics hoses and hose assemblies: guidelines for selection, storage, use and maintenance.<\/li>\n\n\n\n<li><strong>ISO 7326<\/strong> \u2014 rubber and plastics hoses: assessment of ozone resistance under static conditions.<\/li>\n\n\n\n<li><strong>ISO 188<\/strong> \u2014 rubber, vulcanized or thermoplastic: accelerated ageing and heat resistance tests.<\/li>\n\n\n\n<li><strong>ISO 8033<\/strong> \u2014 rubber and plastics hoses: determination of adhesion between components.<\/li>\n\n\n\n<li><strong>ISO 10619-1 and ISO 10619-2<\/strong> \u2014 rubber and plastics hoses and tubing: measurement of flexibility and stiffness, at ambient and sub-ambient temperatures.<\/li>\n\n\n\n<li><strong>ASME B1.20.7<\/strong> \u2014 hose coupling screw threads, including the NH, NHR and NPSH series used on hose couplings.<\/li>\n\n\n\n<li><strong>NFPA 1961<\/strong> \u2014 standard for fire hose.<\/li>\n\n\n\n<li><strong>EN 14540<\/strong> \u2014 fire-fighting hoses: non-percolating layflat delivery hoses for pumps and vehicles.<\/li>\n\n\n\n<li><strong>NSF\/ANSI 61 and NSF\/ANSI 372<\/strong> \u2014 drinking water system components: health effects, and lead content in wetted components.<\/li>\n\n\n\n<li><strong>FDA 21 CFR 177.2600<\/strong> \u2014 rubber articles intended for repeated use in contact with food.<\/li>\n\n\n\n<li><strong>EU Regulation 10\/2011<\/strong> \u2014 plastic materials and articles intended to come into contact with food.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Water hose types are a combination of three specifications that are always chosen together: duty, size and material. By duty there are nine families \u2014 delivery, suction and discharge, washdown, potable, hot water, irrigation, lay-flat dewatering, fire service and garden. By pressure, ISO 1403 and ISO 6224 classify general-purpose water hose as Type 1 at [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5579,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[1992,1991,2023,2022,763],"class_list":["post-5593","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-water-hose-material","tag-water-hose-pressure-rating","tag-water-hose-size-chart","tag-water-hose-sizes","tag-water-hose-types"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.5 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Water Hose Types, Sizes &amp; Materials: ISO 1403 &amp; 6224 Guide<\/title>\n<meta name=\"description\" content=\"Compare water hose types and water hose sizes: ISO 1403 and ISO 6224 pressure classes, a water hose size chart with tolerances, and friction loss in psi.\" \/>\n<meta name=\"robots\" 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