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