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May be used as firestop for openings in floors, ceilings and walls. C = 2-3/8". NOTE1: Size refers to the inside diameter of the pipe or fitting. The outside diameter of RV is\ NOTE2: For venting approved residential, commercial, and industrial gas burning equipment (i.e. gas water heaters, gas furnaces). DO NOT USE on oil or woodburning appliances. Double wall construction consists of an inner aluminum pipe and outer galvanized coated steel pipe. UL<reg> listed and tested to withstand 550<deg> F.