This Aluminum Tee Cap with 3 Inner Diameter 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 Double wall construction UL ListedADA Compliant: No Collection: Round Gas Vent Fuel Type: Natural Gas, Liquid Propane Inner Diameter: 3 Material: Aluminum Pipe Class: Type B Pipe Shape: Round Style: Contemporary Modern