Little Giant 566009 Low Water Cut-off Switch, 150 Volts Protect pump from damage due to low water levels; power cord voltage single-phase, 150 volt Equipped with a piggyback plug/receptacle connecting submersible pump's electrical cord Cut-off switch will cut power on submersible pump when the water level in your skimmer drops As water level returns to normal levels, the switch automatically restores power to the pump Measures 3.5-inch width by 5-inch height by 1.75-inch depth