Mayfair Replacement Cartridge Bilge Pump Motors by Johnson Pump Replace your boats worn bilge pump cartridge with Johnsons Pump replacement cartridge motor. This kit is a universal replacement for all Johnson Pump cartridge bilge pumps and cartridge livewell pumps. Simple, two-handed twist and pull operation to remove and replace the motor cartridge makes installation easy. Cleaning debris from the impeller has never been simpler or easier! Designed to be highly efficient, durable, and long-last