Selkirk 185600 Gas Vent Termination Kit, 5 InchRound Gas Vent Double Wall Construction with its built in air space, provides permanent insulation and keeps the inner pipe hot and outer cool. Highlights: Round Vent Pipe and fittings are designed for use on approved gas appliances in residential and light commercial applications Pipe is sold separately (top, flashing, storm collar & draft hood connector Pipe is not included and the part for the 12 inch pipe is # 5rv 12 SOLD separately) Underwriters