We stock two basic types of pumps. The first is diaphragm pumps which are self priming and maintain pressure in your plumbing system, which is controlled by an internal pressure switch. The second type of pump are the noticeably cheaper ones, and these are centrifugal pumps. There is no built in pressure switch, so these need to be controlled by switches built in to the tap, a foot switch, or even to switch on with a room light. These pumps will not stall, so can continue to run, even though the tap is closed. Bilge Pumps Click Here Fuel Pumps Click Here General Water Pumps Click here Pump Spares & Filters Click here Shower & Discharge Systems Click Here Not sure if our pumps match yours? Click here for a Pump Comparison table