3/4" x 1", Sharkbite RT Pex Barb Reducing Coupling, Made Of Lead Free DZR Brass, Easy To Install, Allows For You To Reduce Pipe Size With 1 Fitting, Compatible With Potable Water Distribution & Hydronic Heating Applications, Can Be Used InBoth Stainless Steel Clamp Systems Or A Copper Crimping System, ASTM F1807, SNF/ANSI 61, NSF 372 Approvals.