SharkBite,1/2 " PEXA Expansion x 3/8" O.D. compression straight stop valve designed for use with PEXA pipe and expansion rings. SharkBite expansion fittings are designed for use in potable water distribution systems. Expansion fittings require an expansion tool in ordered to make the connection. Lead-free dezincification resistant brass construction. 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.