The leakSMART second-generation leak detection shut-off valve for 3/4" Water Main includes one (1) second-generation leakSMART patented, automatic water shut-off valve (3/4"). Leak Protection: the leakSMART second-generation valve is a patented, electronic motorized brass water ball valve that connects directly to your home’s main water supply and automatically shuts off your water in the event of a leak. Leak Detection: leakSMART sensors (sold separately) are wireless and waterproof, so you can easily and continuously monitor moisture and temperature throughout the house. Professional installation is recommended. Connect. Protect. Trust.