SELKIRK CORP 183600 Gas Termination Kit, 3-Inch 3" inch, 3RV-TK, 4 Piece, Round, Type B, Gas Vent Termination Kit Includes top flashing, storm collar and draft hood connector Constructed from galvanized steel, which resists corrosion Type B gas vent kit for gas appliances in residential and light commercial and industrial applications Outer pipe has internal spacing bends, to assure a uniform insulating air space between pipe walls