3/8", Sharkbite Push To Connect Endstop Plug, Easy Way To Cap Copper, CPVC Or Pex Pipe In Any Combination With No Soldering, Clamps, Unions Or Glue, Perfect Solution For Pressure Testing A Home, Reusable, Just Insert The Pipe & The Stainless Steel Teeth Bite Down & Grip Tight, While A Specially Formulated O-Ring Compresses To Create A Perfect Seal, Disassembly Is Just As Fast Using The Simple Disconnect Tool, Can Be Rotated After Assembly For Easier Installation In Tight Spaces, Certified For Potable Water Supply & Hydronic Heating Applications, Use To Conform To California Ab1953 Low Lead & Vermont S152 Low Lead Laws.