3/8" Copper Tube Size, Stackable Quick Connect Elbow, Allows Quick Connect Connection Without Cutting Small Pieces Of Pipe, 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.