Whale Marine Electric Bilge Sensor SwitchThe electric bilge sensor switch by Whale Marine is designed to work with your bilge waste system by sensing water levels. Once the switch senses 2" of wter it will automatically turn the bilge pump on until the water reaches below 1/2". The body of the switch is nylon to hold up to high temperatures.Specifications: Voltage: 12V d.c. or 24V d.c.; Current: Suitable up to 20A; Standby current: .008A;