The Apollo ExpansionPEX 1/2 in. Chrome-Plated Brass PEX-A Barb x 3/8 in. Compression Quarter-Turn Straight Stop Valve is simple to install and provides flow control through a quarter-turn ball valve. Most commonly used at point of use fixtures, it allows for repair and maintenance of fixtures without the need to shut down flow control to the entire system. The 3/8 in. compression outlet provides the capability to install 3/8 in. O.D. tubing or 3/8 in. supply lines. It is designed for use on point of use fixtures such as dishwashers, toilets and faucets. Apollo ExpansionPEX barb fittings are a key component to one of the most economical potable water piping systems. Also capable of integration into hydronic heating systems, Apollo ExpansionPEX couplings must be secured into place Apollo ExpansionPEX sleeves or comparable expansion-type sleeve or ring (all sold separately). The Apollo ExpansionPEX system is a comprehensive piping system comprised of lead free brass fittings, poly alloy fittings, manifolds, valves, fasteners, tools and tubing designed for implementation in water delivery systems, simple or complex. Features: Individually bagged Larger internal diameter of Apollo ExpansionPEX fittings results in a 25% greater flow rate within the system Constructed of chrome-plated lead free dezincification resistant (DZR) brass for superior reliability and strength Cold-expansion tool (sold separately) is required for installation Meets or exceeds ASTM F1960 standard Meets UPC, IPC and cUPC standard Barb x compression connection for PEX plumbing systems NSF listed Rated to 200 degree F and 200 psi Item is not compatible with PEXb pipe, crimp-style (ASTM 1807) or pinch clamp (ASTM F2098) piping systems