This DuraLiner 6 Chimney Relining Masonry Thimble with Slip Connector efficiently helps venting of heating appliances while protecting masonry chimneys from the damaging effects of flue gas. Use to penetrate masonry chimney to allow connection of DuraBlack or DVL to DuraLiner. Adapter must be used to attach the connector pipe to the masonry thimble.ADA Compliant: No Collection: DuraLiner Fuel Type: Coal, Gas, Oil, Pellet, Wood Length: 10, 7-1 4 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: 3