This adapter is used to increase the size of the pipe from the double wall stove pipe to the chimney pipe. Model DSP has an attractive outer black painted surface made of durable aluminized steel to withstand temperatures up to 1200 degrees F of continuous operation.Finish: Black Fuel Type: Wood Inside Diameter: 7-8 9 Length: 11-5 8 Material: Aluminized Steel, Stainless Steel Outside Diameter: 7-1 2 - 8-1 2 Pipe Class: Stove Pipe Pipe Inside Diameter: 6 - 8 Pipe Shape: Round Temperature: 1200 degrees F UL Listed: Yes Vent Construction: Double Wall