This adapter may be required to adapt some stove flue outlets to double wall stove 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: 5-8 9 Length: 5-3 4 Material: Aluminized Steel, Stainless Steel Outside Diameter: 7 Pipe Class: Stove Pipe Pipe Inside Diameter: 6 Pipe Shape: Round Temperature: 1200 degrees F Top Diameter: 6-1 2 UL Listed: Yes Vent Construction: Double Wall