Check the listing for details. DURAVENT DirectVent Pro - 5" x 8" Galvanized Storm Collar #58DVA-SC. Condition: New. Listed at 23.99 USD. DirectVent Pro 5" x 8" Galvanized Storm Collar #58DVA-SC The DirectVent Pro 5" x 8" Inner Diameter Galvanized Storm Collar is a component that is used in a typical venting installation. The storm collar is used to maintain a weather tight resistant seal between the pipe and the flashing.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.