Female External O-Ring Tube End With O-Ring. 1/2 In. OD x 2-3/4 In.FEM. EXT. ORING TUBENaturally lightweight for easy handling and installationDorman’s resilient aluminum tubing is the ideal in countering corrosion, rust, and warping. For use in the air conditioning system or anywhere else tubing has eroded.Aluminum TubeSuitable for a wide variety of usesVarious sizes depending on applicationA/C Repair LineLeak-resistantA/C, Tubing, Air Conditioner, Air Conditioning, TubesEXTERNAL O-RING TUBE ENDAir Conditioning Repair