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Insul-Seal 4" x 22 Degree Elbow
Used to insulate waterlines from the furnace to the building. 4" inside dia. x 10' sticks of PVC pipe covered with foam. With an outer protective jacket to ensure immensely watertight piping (when installed correctly.)

Use Primer and cement to glue male/female sides of PVC together and cover the splice in the insulation with joint tape will make the pipe virtually impenetrable.