Watts Brass & Tubular P-1070, 1", Copper Tube Size Quick Connect End Plug, For Use With Pex, Copper, CPVC & Polybutylene Tubing, Holds Up To 250 PSI, 1 Piece Fitting, No Parts To Assemble Or Lose, Quick Connect Design Allows Quick & Easy Connections Without The Use Of Installation Tools, Great For New Installations Or Plumbing Repair Projects, Only Fitting Of Its Type Code Approved For Behind Wall Installations, NSF-14, NSF-61, CSA/ASTM & UPC Code Listed & Approved, Excellent Replacement For Qest & Flare It Type Fittings.