... 2. AC adaptor12V- CE,UL approval 3. Control unit 4. electric ball valve(1/4",3/8" ... hot water tanks, piping, washing machine, water treatment.... How to use • Put the water sensor on the place where ... have leaks, then the valve connected to the central unit • Connect central unit to the AC power,(Power LED indicator ... if the AC power is OFF, the central unit will still operate, detect water leakage and ...