The Rule 1500 Rule-Mate Automated Electric Submersible Bilge Pump offers high pumping capacity and reliability at a lower cost. The Rule 1500 offers more pumping capacity and more exclusive design features than any comparable competitive pump. The pump and non-mercury float switch are in a single, compact housing. As the water level rises, so does the float switch, activating the pump when the water level reaches 2-1/8”. There is no on/off cycling and therefore, no power use until the pump comes on.