Rv 3 In. X 6 In. X 3-1/4 In. Gas Vent Cap

External screen prevents entry of most bird species. Aluminum top and galvanized flashing. Slips inside of pipe and locks into place with spring clips. Must not be used for woodburning applications. Size refers to the inside diameter of the pipe or fitting. The outside diameter of RV is approximately 1/2" larger. Type B gas vent.