Whale Watermaster Inlet Socket with Integrated Pressure SwitchWhale Watermaster Inlet Socket With Integrated Pressure Switch (Ivory) ES1001 The Whale Watermaster Inlet Socket with Integrated Pressure Switch is an external socket, designed to pump water from an outside container into your caravans water system. The Watermaster inlet works in conjunction with Watermaster submersible pumps, a great way to get fresh water into your caravan. The socket inlet is available in white with a lift up hinged lid to keep any