The Rule-Mate 1500 GPH pump consists of a powerful Rule bilge pump and a highly intelligent circuit board in a single housing. The pump activates when the water reaches ca. 7 cm (2-3/4") and automatically shuts off when the pump senses no water against the impeller, reducing the remaining water to approximately 1,6 cm (5/8").Rule-Mate Bilge pumps have built-in programming that can sense when the pump is running but not pumping water. This is a very unique feature to bilge pumps because it protects the pump and the vessel, especially the vessel's batteries. If debris fouls the sensor or the pump becomes air-bound, the pump will stop running and begin to "check" for water every 2 1/2 minutes. Once the debris is removed, the pump will revert to its normal operation, turning on when the water reaches ca. 7 cm (2-3/4") and shutting off at ca. 1,6 cm (5/8").
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