1/2" x 3/8" compression straight stop; lead free, 23037-0000lf, sharkbite push-fit fittings for use with copper tubing cts, cpvc and pex with integral tube liner included; constructed of dzr brass, certified to 200 psi and 200 degrees f, design certified to asse 1061/nsf61 standards, meets upc, ipc and cupc requirements; fittings are listed with iapmo and are certified for use on potable and hydronic water distribution. Certified for underground applications and as a manufactured joint without the need for access panels.