Description Whale EP1622 Watermaster/Carver Assembly Premium Flow 12v DC. Quality replacement caravan and motorhome accessories. Whale EP1622 Watermaster/Carver Assembly Premium Flow 12v DC. Whale Watermaster is a simple and convenient way to connect a caravan or motorhome to an external water container via a submersible pump that simply plugs in to the existing connection. The EP1622 incorporates a Whale Premium pump with up to 15.2 L/m flow-rate for multiple outlet applications and is compatible with Truma Crystal ® II sockets.