This Aluminum High-Wind 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 for vertical terminations only Provides improved performance in high wind conditions For vertical terminations only Double wall construction UL ListedADA Compliant: No Collection: Round Gas Vent Fuel Type: Natural Gas, Liquid Propane Height: 7-1 4 Inner Diameter: 3 Material: Aluminum Pipe Class: Type B Pipe Shape: Round Style: Contemporary Modern Weight: 5 Width: 7-1 2