3" inch, 3RV-TK, 4 Piece, Round, Type B, Gas Vent Termination Kit. Includes 1 each of the following: draft hood connector (103240), adjustable roof flashing (103825), storm collar(103810), and vent top (cap/hood) (103800). 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.