... , refrigerators, dishwashers, sinks, aquariums, sump pumps, water heaters, and anywhere with potential water damage2) Specification:Working Voltage: 12VMax. working current: 80mAStandby ... UL approval 3. Control unit 4. electric ball valve(1/4",3/8" 1/2",3/4" and 1" for your selection)3 ... objects that may cause false warning sound. Ground water detector system with solenoid valve for stop water leak