The DuraPlus 6 Class A Chimney Pipe Transition Anchor Plate - 21 x 13 is used when extending or converting from DuraLiner to DuraPlus in chimney restoration. is used with DuraLiner Slip Connector and Hanger.Use with DuraLiner Slip connector and HangerADA Compliant: No Collection: DuraPlus Fuel Type: Coal, Gas, Oil, Wood Height: 1-4 9 Length: 21 Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 6 Pipe Shape: Round Style: Functional UL Listed: Yes Vent Construction: Triple Wall Weight: 10 Width: 13