SAHARA 500 GPH Automatic Marine Bilge Pump 12V. The easiest, most relable bilge pump ever designed! The anti airlock impeller ejects trapped air in the pump and pipework. This product is designed with buoyancy control to reduce cycling and extend the life of the pump. There is a universal mounting pattern, external mounting feet and integrated outlet to simplify installation and use. Changeout pump cartridge from hard-to-reach areas with only one hand.