DuraVent, 58DVA-SC, Direct Vent, 5 Inch x 8 Inch DirectVent Pro, Vent Pipe, Storm Collar, DirectVent Pro Collection 5" x 8" Inner Diameter Galvanized Storm Collar The DirectVent Pro 5" x 8" Inner Diameter Galvanized Storm Collar is a component that is used in a typical venting installation. The DirectVent Pro storm collar is used to maintain a weather tight resistant seal between the pipe and the flashing. Features: Maintain a Weather Tight Resistant Seal Between Pipe and Flashing Inner Diameter: 5" x 8" Outer Diameter: 12" DirectVent Pro features tight inner connections for superb performance, with no gaskets or sealants required (unless specified by the appliance manufacturer) . All black pipe lengths, pipe extensions, and elbows feature laser-welded outer wall seams for a sleek finish. Low-profile locks and no hems or beads allow for a beautiful product that looks elegant in any interior. DirectVent Pro is a unitized, coaxial venting system designed for use with direct vent gas or propane stoves, heaters, and fireplaces. Looking for Simpson Dura-Vent? You found it! Simpson Dura-Vent has changed their name to DuraVent. DuraVent is a recognized technological leader in the venting industry. Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting.The company's research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for PelletVent Pro. Scientifically proven materials and unequalled engineering make DuraVent products not only the best choice, or safest choice, but the only choice for professional quality venting products.