WHALE 1 x Watermaster Socket with Pressure Switch. WHALES New EASI Slide Fresh Water Inlet is the easy way to supply your vehicle with fresh water. Includes socket for exterior submersible pumps, mains water hook up or on board water pump. Use with cold freshwater only. Slick design and uniform look on the vehicles exterior walls. Comfortable to use. Waterproof protection. High quality satin finish. UV stabilised to prevent damage from sunlight. Suitable for and Available Seperately: Ep1612 Watermaster Assembly 12V High Flow pump Assembly. AK8834 Watermaster Service Kit. EM9433 Watermaster Mains Water Connection.