This 1/2 female iron pipe thread x 1/2 crimp poly alloy PEX swivel coupling, straight pattern, is used for connecting 3/8 inch or 1/2 inch WaterPEX supply lines directly from the manifold or branch supply to the faucet. It is manufactured in accordance with ASTM F-1807, and is compliant with CSA standard B -137.5. Package of 25.