Whale Aquasource Watermaster Mains KitEliminates need for water carriers and wont drain your battery No need to worry about the pressure of the water being too high as pressure will be regulated to nominal 1. 5 bar (1. 8 bar max) Suitable for both microswitch and pressure switch systems and comes with an adaptor The Whale Aquasource Mains Water Hook Up is an easy way to connect your van to a tap for continuous water supply. There is no need to take up space with an aquaroll or water