1/2" x 3/8", Coupling Stem, Quick Connect Push Fittings Hold Up To 250 PSI, 1 Piece, No Parts To Assemble Or Lose, Code Approved For Behind Wall Without Access & Direct In Ground Burial Installations, NSF-14, NSF-61, CSA/ASTM & UPC Code Listed & Approved, Replacement For Qest & Flare It Type Fittings.