TSUNAMI 500 GPH Bilge Pump. The easiest, most reliable non-automatic bilge pump ever designed! The anti airlock impeller ejects trapped air in the pump and pipework - preventing pump burnout. 40% better protection against water ingress and electrolysis. This product has a compatible mounting pattern with leading pumps - no new drill holes required. External mounting feet and intregrated outlets to simplify installation and use. Replace the pump cartridge from hard to reach areas with only one hand and without touching plumbing lines.