Check the listing for details. DURAVENT DirectVent Pro - 5" x 8" Galvanized Wall Strap #58DVA-WS. Condition: New. Listed at 27.99 USD. DirectVent Pro 5" x 8" Galvanized Wall Strap #58DVA-WS The DirectVent Pro 5" x 8" Inner Diameter Galvanized Wall Strap is a component that is used in a typical venting installation. The wall strap is used to support vent pipe. Provides 1” clearance. Recommend installing Wall Straps at 4-foot intervals on vertical runs.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.