Whale WaterMaster External Socket
The Whale Watermaster® pump system, is an external pump that let's you easily fill your fixed water tank in a Camper Van, Motorhome or caravan from your roller tank or similar portable tank that use to get water from a site tap.
This inlet socket is mounted to the outside of the vehicle, which is plumbed into your on-board water tank, together with a separate pump assembly that plugs into the socket.
This creates a quick release water-tight connection for the water and also connects the power to the submersible pump and which is then dropped into the portable water tank.
See here for the compatible 12V Whale WaterMaster Submersible Pump Assembly