This DuraLiner Extend-a-Cap Kit - Fits 6 Rigid Pipe, 13 x 18 Base Plate efficiently helps venting of heating appliances while protecting masonry chimneys from the damaging effects of flue gas. Use to terminate DuraLiner at the top of the masonry chimney. Kit includes a base plate, support clamp, storm collar, and cap. Pipe not included.ADA Compliant: No Collection: DuraLiner Fuel Type: Coal, Gas, Oil, Pellet, Wood Length: 18 Material: Aluminized Steel Pipe Class: Rigid Liner Pipe Inside Diameter: 6 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 8