The SharkBite PEX Plastic Barb Supply Stop Valve (2-Pack) is an easy to install, low cost solution to install shut-off valve underneath your sink or toilet. Simply clamp or crimp the valve onto PEX and then use a braided supply line to connect the valve to the fixture. Advanced Polymer Plastic fittings are a perfect solution for areas where corrosion may affect DZR Brass Fittings. SharkBite PEX Plastic Barb fittings are suited for potable water distribution. These PEX fittings may be used with the stainless steel clamp system or the copper crimp ring system (both sold separately). The SharkBite PEX Barb fitting range offers a wide variety of Fittings, Manifolds, Valves, clamp rings, crimp rings and tools in various sizes to help complete your next plumbing project.