The SharkBite 1/2 in. Barb x 3/8 in. OD Compression Straight Stop Quarter-Turn Valve controls water flow to household plumbing fixtures. The Straight Stop Valve is used where the water pipe enters the room to allow for easy shut-off of water flow to the end fixture allowing for maintenance and repair without having to turn water off to the entire home. The SharkBite 1/2 in. Barb End can be connected to PEX Pipe using Copper Crimp Rings or Stainless Steel Clamps. The 3/8 in. Compression Outlet with the supplied ferrule and compression nut, can be used with 3/8 in. OD Pipe or 3/8 in. Supply Line. This valve is best suited for use on Toilets, Faucets, and Dishwashers.