The DVL 6 Double Wall Adjustable Black Pipe, 2-10 is a component that is used in a typical venting installation. Use to add length to DVL pipe. 6 pipe adds 2-5 of length, 12 pipe adds 2-11 of length, when used with rigid sections of pipe. 12 section can be ovalized for oval-to-round appliance connector.Fuel Type: Wood Length: 12 Material: 26 Gauge Aluminized Steel Pipe Class: Stove Pipe Pipe Inside Diameter: 6 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 3