What the standard pins down
ISO 1403 covers textile-reinforced rubber hoses for general-purpose water service. It is the document that gives the garden hose shelf the vocabulary it mostly declines to use.
It fixes the bore sizes — the internal diameter the hose is made to, in millimetres, with the tolerances it must hold. It fixes the construction: a lining, a textile reinforcement, a cover, and what each must be capable of. It fixes the pressures: a maximum working pressure for each type and size, and a proof and burst pressure that the hose must withstand in test. And it fixes the tests behind those figures, along with requirements for adhesion between layers, for resistance to ageing and for the hose’s behaviour at low temperature.
It also fixes marking: a hose made to it carries its identification along the cover, which is why a good hose has printing on it and a cheap one has none.
What it does not promise
It does not define a “layer”. The four-, five- and six-layer claims that fill this shelf are a marketing count, not a construction class, and two hoses claiming the same count can be built completely differently. A reinforcement that is a knitted textile and one that is a cross-woven braid behave differently under pressure and in a bend, and neither is what the number records.
It does not cover every hose on the shelf. The flexible expanding hoses, the textile-jacketed hoses and the flat lay-flat types are different articles, and this document is not theirs. Where a listing invokes it for one of those, the claim does not belong to the product.
It does not promise ultraviolet life. A hose coiled in the sun for five summers is in a condition no test in this document reproduces, and it is the way most garden hoses actually end.
It does not promise a flow. Flow is bore, pressure and length together, and it is the thing a buyer actually wants — which no hose listing states.
And it does not promise the fittings. The claw couplings, the click connectors and the tap adapters are a separate world with their own thread standards, and a good hose ends in whatever the brand decided.
The documents it sits next to
The threads at the tap are the parallel pipe thread family, and on the brass end sometimes the tapered one. Both have their own pages here.
Where a hose feeds a pressure sprayer or a pump, the appliance standard for that machine applies to the machine and not to the hose.
Which shelves it reaches here
The hose family cites it, along with the reel, connector and drip irrigation shelves, because a reel is sized in hose bore and length and a drip line begins where a hose ends.
Where a listing prints a layer count, this site prints it as the maker’s count and says no document defines the term. Where a bore and a working pressure are stated, the page prints those instead — they are the figures that let two hoses be compared at all, and they appear on perhaps a third of this shelf.
The questions that keep coming in
Is a six-layer hose better than a four-layer one?
There is no definition of a layer to compare. A maker counts a thin anti-algae film as a layer if it chooses. What can be compared is the stated bore, the working pressure and the burst pressure, and a hose that publishes all three is telling you more than one that publishes a layer count.
Why does my hose kink at the reel even though it is reinforced?
Reinforcement resists pressure from inside; kinking is a bending behaviour, governed by the wall construction and by how cold the hose is. A hose that is supple in August is a different object in February, and no pressure rating predicts it.
What bore should I buy?
Bore decides how much water arrives at the far end, and the difference between a 13 mm and a 19 mm hose over thirty metres is large. Most domestic fittings are made for the smaller one, which is why it dominates the shelf rather than because it is the better choice.
Last reviewed 26 September 2026