Water Alarm with Water Valve Stops Sink Leaks Automatically to Reduce Damage Overstock Special. Save Money! Install a Floodstop FS3/8CD water alarm with automatic water valve shut-off that closes both hot and cold water supplly lines when water leaks under a sink. Sounds an 87 db alarm. Flood Stop unit has two full port motorized water valves, lead free, with 3/8 inch compression fittings to fit hot water and cold water lines. This advanced water leak detection system helps prevent water damage and is easily installed. These brass water valves meet California, Vermont and all USA state lead free water valve standards for drinking water. Flood Stop Sink/Wash BInstallation is Simple: Connect the water valve to cold and hot water lines under the sink. Mount the control unit. Place sensor(s) on floor. Plug power supply into an un-switched outlet. Note: electricity is used only when the sensor detects water. NOTE: DO NOT PLACE SENSOR DIRECTLY ON METAL PAN OR DAMP FLOOR. If no water ispresent and alarm sounds, place paper towel or cloth under sensor to "insulate" against floor dampness or metal of pan. When the paper or cloth gets wet, the sensor activates the shut-off and sounds the alarm. How FloodStop (FS 3/8-CD) Works: FloodStop valves connect to the angle stops and supply lines. Water leak sensor is placed at the base of the fixture (sink, laundry tubs, bathtub, etc.). Valve remains open until a water leak or water loss is detected. Water on the sensor signals the Floodstop controller which closes the valve and alarms. Valve remains closed until system is reset, and sensor is dry. FloodStop (FS 3/8-CD) Components: Motorized Ball Valves (Two Valves, 3/8 inch Compression Fitting). Control unit with battery backup (4 C batteries, not included). AC power adapter (or use 4 C Batteries as primary power source). Water leak sensor (1.25" X 7.5"). Output contact wires (2). Technical Specifications: UL Listed Class 2 Wall Adaptor, 115AC/9VDC. UPC listed,