The SharkBite PEX Poly Alloy Adapter is an easy to install, low-cost solution to connect PEX tubing to a male threaded connection. These fittings are suitable for potable water distribution and hydronic heating applications. SharkBite PEX Poly Alloy Barb fittings can be used in both a stainless steel clamp system, or a copper crimp ring system as well (each sold separately). Approvals: ASTM F2159, NSF/ANSI 61, NSF 372.