DirectVent Pro is a unitized, coaxial venting system designed for use with direct vent gas or propane stoves, heaters, and fireplaces, Stunning design and Engineered Excellence utilizing state-off-the-art manufacturing, DirectVent pro features tight inner connections for a superb performance, with no gaskets or sealants required (unless specified by the manufacturer), Low-profile locks and no hems or beads allow for a beautiful product that looks elegant in any interior, Use to maintain a weather tight resistant seal between the pipe and the flashing, 5"" Inner Diameter, Configuration: Storm Collar, Depth: 12, Fuel Type: Gas, Liquid Propane, Material: , 020"" Aluminum / , 021"" Galvanized Steel, Aluminum, Galvanized Steel, Pipe Class: Direct Vent, Pipe Inside Diameter: 5 x 8, Pipe Shape: Round, Theme: Modern, UL Listed: No, Width: 12, SKU: TWST3614