SELKIRK RV 4 In. x 3 Ft. Round Gas Vent Pipe

Easy to assemble and can be combined to obtain the required installation height. Couplers overlap 1-1/2" when joined. Assembled length is 1-1/2" less than listed lengths. 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. Can be used as part of a water heater vent pipe.