Supplying water in a campervan can be done most simply with a submersible pump and an onboard water tank. I decided that this would be the route I took also. Similar to fitting the gas, I cut a section of the cupboard floor out to house two 10l fresh water tanks (using 2 smaller tanks proved the best use of space due to the position of the wheel arch).
I then bought a Reich 14l/min submersible pump for a 10mm tube – this matched the size and make for the tap. The pump and the tube came from a local caravan/camping shop.
I fitted the tube to the “push-on” fixtures and secured at the top with a jubilee clip. The pump is then wired back and turned on and off with the tap micoswitch. A quick test and it all works well.
I later changed the configuration of the electrics to incorporate a 30A Relay. This is because the microswitch in the tap is only cut out for small loads and might blow and need replacing if used to directly control the pump.