This Aluminum 6 Inch Inner Diamerter Tee Cap from the Round Gas Vent series is a Type B gas component and consists of the duralock system for a tight seal. Use to cap Standard Tee or Increaser Tee. Remove Tee Cap to inspect the system clean out debris or collected condensate from the common vent. Fits on inner liner.Finish: Aluminum Fuel Type: Gas, Liquid Propane Material: Aluminum Pipe Class: Type B Pipe Inside Diameter: 6 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 1