Aluminum 45 Degree Pipe Elbow Covers are made up of two precision cut matching halves that are used as weatherproofing/mechanical abuse protection on insulated piping. Aluminum Elbow Covers are made of alloy aluminum in .024″ thickness for superior mechanical abuse protection. The inside of both halves are coated with a moisture retarder film to prevent electrolytic degredation while the outside is clear coated to prevent exterior corrosion. Easy installation includes screwing the two halves together over the insulated elbow (hot systems) or banding together (cold systems). Aluminum tinted silicone caulk should be used to seal all joints.