Sharkbite, 4 Pack, 3/4", End Stop, Connects Copper, CPVC Or Pex Pipe In Any Combination With No Soldering, Clamps, Unions Or Glue, Insert The Pipe & The Stainless Steel Teeth Bite Down & Grip Tight, While A Specially Formulated O-Ring Compresses To Create A Perfect Seal, Disconnect Tool Allows For Fittings & Valves To Be Easily Changed & Reused, Can Be Rotated After Assembly For Easier Installation In Tight Spaces, Certified For Potable Water Supply & Hydronic Heating Applications.