Whale Electric Field Sensor SwitchWhale BE9003 electric field sensor automatically senses the water level in the bilge and operates the bilge pump accordingly. When water levels reach 51mm (2") of water, the sensor turns the bilge pump on and will continue pumping until the water level drops below 13mm (1 2"). The sensor is made from nylon, making it suitable for withstanding high temperatures. This Whale bilge water sensor can be easily mounted on the base or on its side to suit your