Flood Prevention Valves are more than just your regular ball valve. In its entirety, it's comprised of a valve and an electronic system with sensors that can detect water on the ground. As soon as water is detected, a signal to shut off the valve is sent. This prevents mass flooding and costly damages to your home. The valve must be installed on the cold water supply line of a tank or tankless, gas or electric water heater. Canarsee offers the best Flood Prevention Valves on the market, manufactured by Taco.