Rule Rule-Mate 1500 GPH Fully Automated Bilge Pump - 12V [RM1500A]Rule Mate 1500 GPH 12 Volt Fully Automated Bilge Pump 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 activated when the water reaches 2 1 2" and automatically shuts off when the pump senses no water against the impeller, reducing the remaining water to approximately 5 8". Rule Mate Intelligence Rule Mate Bilge pumps have built in programming that can sense when