DuraVent DVL Double Wall Black Pipe Masonry Adapter Size:8 in. The Siding Trim Kit will The Siding Trim Kit will provide a leak free wall pass through for both aluminum and vinyl siding but should not impinge on the inside area of the flue liner one exception to this is that round based pots may impinge at the corners of a square flue but not by more than 3 4 in DuraVent DVL Double Wall Stove Pipe Masonry Adapter is used to connect the DuraVent double wall stove pipe to either a masonry chimney or to a stainless steel chimney liner tee connection installed in a masonry thimble The Masonry Adapter is equipped with a trim collar to provide a finished look when connected to the masonry chimney or the chimney liner kit