The WaterCop Water Shut-Off Valve, Lead Free is an essential component of the WaterCop Shut-Off system and connects directly with a WaterCop Actuator Motor (sold separately) to close and open your main water line. When a paired WaterCop flood sensor, Water Control Switch, or smart security system notifies the WaterCop Actuator Motor of a detected leak, the WaterCop Motor will close the Shut-off Valve. The WaterCop System provides your home with round-the-clock indoor leak and flood detection and protection. The system consists of wired and wireless flood sensors, On/Off control switches, and a main control device consisting of an actuator motor and ball valve mounted on your main water line that all work together to detect leaks from your plumbing system or excessive water in selected areas and automatically shut off the water supply to help reduce and/or minimize the chances of major water damage. A WaterCop automatic water shut-off valve system is compatible with most home security and home automation systems via ethernet connection. A complete WaterCop System consists of three essential components. First, a WaterCop Electric Actuator Motor that receives wireless signals from paired flood sensors to automatically seal the main water line. Second, a ball valve that mounts onto your main water line and connects to the WaterCop Motor to seal your water supply. Finally, wireless or wired flood sensors which detect water and transmit alert signals to the WaterCop to turn off your water supply. NOTE: The WaterCop requires household electrical power (common 115 VAC, grounded outlet) and will not operate during a power outage. All WaterCop brass valves comply with published NSF61 standards which restrict lead and other metal contaminants to safe levels for drinking water systems; the lead-free valves are approved for sale in all U.S. States, and comply with California AB1953 and Vermont S.152 laws. Part #: WCVLF1.