The DuraBlack 9 - 10 Single Wall Stovepipe Increaser is a component that is used in a typical venting installation. The DuraBlack increaser is used to increase from a smaller appliance flue outlet to a larger diameter chimney or stove pipe.ADA Compliant: No Collection: DuraBlack Finish: Black Fuel Type: Wood Material: Dura-Black 24 Gauge Steel Pipe Class: Stove Pipe Pipe Inside Diameter: 10 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Single Wall Weight: 3