3/8" Copper Tube Size x 7/8" Quick Connect Swivel Elbow, Holds 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.