New innovative design incorporates the bilge pump and water sensor in a single housing. Unique Rule Spongeability feature leaves the bilge the driest ever – when water in the bilge reaches a certain height the sensor automatically activates and the pump runs until water is pumped out, reducing boat weight, saving fuel and minimizing bilge odour. Pump check feature – simply touch the pump check button and hold for afew seconds to test cycle the pump. 3 year limited warranty. 500 amp; 750 requires 3/4 ID hose 1100 requires 1.1/8 ID Hose