Check the listing for details. DURAVENT DirectVent Pro - 5" x 8" Galvanized Elbow Strap #58DVA-ES. Condition: New. Listed at 27.99 USD. DirectVent Pro 5" x 8" Galvanized Elbow Strap #58DVA-ES The DirectVent Pro 5" x 8" Inner Diameter Galvanized elbow strap is a component that is used in a typical venting installation. The elbow strap is used to support vent pipe between offsets. 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.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.