3/8" x 1/2", lead free reducing coupling, sharkbite push fit fittings for use with copper tubing cts, cpvc & pex with integral tube liner included, constructed of dzr brass, certified to 200 psi & 200 degrees Fahrenheit, design certified to asse 1061/nsf61 standards, meets upc, ipc & cupc requirements, fittings are listed with iapmo & are certified for use on potable & hydronic water distribution, certified for underground applications & as a manufactured joint without the need for access panels, lead free compliant to federal law 111-380.