WHALE Watermaster Assembly 12V High Flow. Watermaster Freshwater Connection Range The Name Says It All! Simplifies the connection between an outside water container into the caravan. Simplifies the connection between an outside water container into the caravan Top performance pump Suitable for microswitch or pressurised systems Choice of flow rate to suit either a simple one or two outlet system with two or more outlets including a shower. Incorporates an anti air-locking pump enhancing the performance of the WHALE water system The easily replaceable pump that can be removed and replaced if necessary Easy fit plug stays secure Watermaster? with 12 V d.c. High Flow pump and plug for WHALE? Socket (dark blue hose).