There aren't fittings that will do the job, unfortunately. You might be able to get a threaded (male) fitting, the same as the end of the shower head that fits on the shower hose, that will fit on 15mm pipe (solder or compression fitting). If you could get the 15mm pipe down the end of a bit of hose that would give you a converter.
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Shower 15mm hose coupler hose hose pipe
The short length of hose with a standard hose connector one end and the 15mm pipe (with threaded fitting on the end) at the other would be your converter, leaving the normal hose untouched.
That's how I would do it but you may have been contemplating rather less work!
Not really a problem. A standard shower hose uses 1/2" BSP threads. A standard outside tap - to which you would normally attach a garden hose - has 3/4" BSP threads on its output - but some have 5/8" BSP or even 1/2" BSP threads.
If you buy a hose/tap connector (Hozelock, Gardena or whatever) from a hardware shop or garden centre, it will be designed to screw onto a 3/4" tap. BUT it will probably also be provided with 5/8" and 1/2" adaptors. If you can get one with a 1/2" adaptor, this will screw straight onto your shower fitting in place of the existing shower hose. [If it doesn't come with an adaptor, you will need to buy a brass 3/4"BSP to 1/2"BSP reducer from a plumbers merchant - but you may have more difficulty getting it to seal on the shower fitting because it won't have rubber washers like the plastic adaptor would.
Incidentally, the mind boggles as to why you want to extend your shower into the garden!
I'm not sure but isnt this a recipe for trouble? Your cold usually comes through at higher pressure than hot, and with a relatively high impedance long hose on the end the cold is liable to flow back up the hot supply pipe, resulting in backward water flow thru the hot system, and hopefully appearing at the overflow. If youre less fortunate, appearing on the downstairs ceiling.
Well, my hot water is mains pressure. Any outside tap (or shower fitting capable of reaching a bath, basin or shower tray) should have a double check valve fitted to prevent backflow.
Hmmm....this might be a workable alternative to clamping a hose connector to one of the bath taps when we fill up one of our waterbeds. Power shower pump tends to blow the connector off now and then.
Thanks for all the responses, I'd never thought about taking a shower outside before... ;)
Actually I'm planning to use the hose to wash the car - the bathroom is the most logical place to connect the hose (it's closest to the front door) and if the adaptor leaks/comes off the water will land in the bath. I have a combi boiler so the hot water is coming via the mains supply. I will most likely only use the hose with cold water (mains pressure) and connect it to a shower hose via a flow-return valve so that should avoid water going back through the hot water pipes (hopefully).
My car will be happy now that it can finally have more than one bath a year...
However, note the hose isn't designed to take hot water, it will soften and will split or the connectors will be liable to come apart if there's much back pressure (finger over the end, kids spraying each other).
Keep the water temperature as low as possible and avoid any spray type thing that can shut the flow off completely, even if only in rotating the jets.
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