The switch powers up in an off state and meets or exceeds both the Canadian & U.S. Coast Guard standards. Currently in use by the U.S. Coast Guard, this switch is designed to precisely monitor water levels. The 23-12B will only activate only after detecting water for 3 continuous seconds. Once water has left the sensor, it will instantly turn off.
Waterproof - impermeable to all bilge substances
No moving parts
Will not pump pure gas, diesel or oil
Eeasy to install
7 year unbeatable limited warranty
Includes buzzer