This 4 Inch Pellet Chimney Increaser Tee with 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. Attaches 3 pipe to branch and 4 pipe to body. Use for a 90° offset. Branch swivels for alignment. Removable twist-lock Clean-Out Tee Cap.Finish: Stainless Steel Fuel Type: BioFuel, Oil, Pellet Height: 10 Material: Galvalume, Stainless Steel Pipe Class: Type L Pipe Inside Diameter: 4 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 2