This Aluminum Storm Collar with 5 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 maintain a weather tight resistant seal between the pipe and the flashing.Maintains a weather tight resistant seal Double wall construction UL ListedADA Compliant: No Collection: Round Gas Vent Fuel Type: Natural Gas, Liquid Propane Inner Diameter: 5, 7 Material: Aluminum Pipe Class: Type B Pipe Shape: Round Style: Contemporary Modern Weight: 5