This 4 Inch Pellet Chimney Stainless Steel Clean-Out Tee Cap from the PelletVent Pro series is a Type B gas component and consists of the duralock system for a tight seal. Use this clean-out tee cap as a replacement.Finish: Stainless Steel Fuel Type: BioFuel, Oil, Pellet Material: Galvalume, Stainless Steel Pipe Class: Type L Pipe Inside Diameter: 4 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Weight: 2