6" DuraVent DuraLiner Stainless Steel 45-Degree Elbow 6DLR-E45SS 6" DuraLiner Stainless Steel 45 ° Elbow is used as an insert connector to DuraLiner. Features built-in fittings for easy connection to DuraLiner. Elbows are single-wall. Diameter: 6" Angle: 45 degrees Stainless Steel Features built-in fittings for easy connection to DuraLiner Single Wall Use as an insert connector to DuraLiner .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.