SharkBite 1/2 in. Brass Expansion Copper Stub-out (3 in. x 6 in.)SharkBite expansion fittings are designed for use with PEX A pipe and expansion rings. SharkBite expansion fittings are designed for use in potable water distribution systems. Compatible with PEX A pipe only Requires PEX expansion tool and expansion rings to make connection Approved for water service lines and burial applications including concrete Meets ASTM F 1960 and ASTM F 877 standard Meets UPC, IPC and cUPC requirements Listed to NSF 14 61