BrassCraft® 1/2 in nominal cold expansion PEX barb inlet x 3/8 in OD compression outlet multi-turn angle valve controls water flow to household plumbing fixtures - faucets, toilets, dishwashers, icemakers, washing machines and more. The angle valve is most often used where the water pipe enters the room from the wall. With a few turns of the valve handle, you are able to stop or start the flow of water leading to the plumbing fixture, allowing for maintenance and repair without shutting off the water to the entire home. Cold expansion PEX end designed to ASTM F1960. BrassCraft® Water Supply Stop, 1/2 x 3/8 in Nominal, Cold Expansion PEX x OD Compression, 125 psi, 40 to 160 deg F, Polished Chrome, Domestic