SharkBite polybutylene conversion coupling. SharkBite push-fit fittings are the fastest, easiest way to join copper, CPVC, and PEX in any combination, wet or dry. Approved to be used underground and behind walls without access panels. Fittings are certified to 200 P.S.I. and 180 deg. F. (82 deg. C.). Integral tube liner for PEX installations which means no loose connections. The SharkBite design is certified to ANSI/NSF-61 and ASSE 1061 product standard for use in potable water and hydronic heating water distribution. Manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.