6" DuraVent DuraLiner Wall Pass-Through 6DLR-WPT 6" DuraLiner Wall Pass-Through is used to connect to a DuraLiner tee. Transitions DuraLiner through a masonry chimney and a combustible wall. Allows the connection of DuraBlack pipe when used with the appropriate adaptor. DVL black pipe will connect directly to the Wall Pass-Through. Diameter: 6" Connects through masonry chimney and a combustible wall Sturdy construction for long-lasting durability .016†304 stainless steel inner liner. Rigid relining pipe: double-walled with 304 stainless steel inner and galvalume outer. Factory insulated between inner and outer walls.