This Increaser Tee with Clean-Out Tee Cap - 4 Inch Inside Diameter 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: Black Fuel Type: BioFuel, Oil, Pellet Height: 10 Material: Galvalume, Stainless Steel Pipe Class: Type L Pipe Inside Diameter: 3 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 5