6" DuraVent DuraLiner 30-Degree Round-to-Oval Stove Connector 6DLR-CNRO 6" DuraLiner 30 ° Round-to-Oval Stove Connector is used to connect an insert to round or oval DuraLiner pipe at a 30 ° angle. Diameter: 6" Angle: 30 degrees Round-to-Oval connection .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.