6" DuraVent DuraLiner Flat Oval Stove Connector 6DLR-FCNO 6" DuraLiner Flat Oval Stove Connector is sized to convert round stove outlets to oval DuraLiner pipe. Diameter: 6" Dimensions: 8 1/4" x 15" Height: 2 1/2" .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.