Does anyone happen to know the thread size on a car tyre valve and any suggestions for getting to that size male (so I can screw my compressor to it) from a 1/2” bsp female (15mm hose union back plate)?
I'm not sure exactly what you're trying to do, I assume inflate a tyre from a compressor. Normally the compressor pipework would connect to a female outlet, into which you plug your air tools, including a tyre inflator.
Actually I want to drain down a static caravan. Attaching a tyre compressor to the outside tap back plate and blowing all residual water out of the pipe work will leave it safe against freezing through the winter.
Ok I see. You could buy a tyre valve, cut the rubber end off and push a hose over the stem. You could possibly fit an outside tap to the plate and then connect the hose to that, but normally they have non-return valves.
Thanks for your input. You wouldn’t believe the trouble I’ve had trying to solve this. Normally I’d have gone into the local plumbers merchant and had a rummage round but with covid rules I can’t. I’m sure the valve is either 1/4 bsp or 1/4 npt but which one nobody seems to know. Google included.
Buy a brass one remove the valve insert and solder it into a brass bush that fits the van thread. https://www.ebay.co.uk/itm/2pcs-1-8...Tank-Fill-Valve-Plated-Schrader-/173278797464
Thanks everyone for your input especially “Another Top Job” I don’t know how you found that but it looks like just what I need. Firms can do the job for me and charge about £60. There is also a compressor that another firm install in the ‘van connected to the water pipes to do the same job for £299. So you see why I want to do it myself.
Sorry. Job done. A 1/2” BSP male to 15mm Prestex with a car tyre valve pushed in to stick out of Prestex nut and sealed with Gorrila glue. Screwed into tap backplate and all water blown out with tyre compressor. £1:88 for fitting £2 for valve. Well pleased.
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