Check the listing for details. DURAVENT DirectVent Pro - 4" x 6 5/8" Galvanized Outer 36" Pipe #46DVA-36. Condition: New. Listed at 66.99 USD. Description DirectVent Pro- 4" x 6 5/8" Galvanized Outer 36" Pipe #46DVA-36 The Directvent Pro 4" x 6-5/8" Inner Diameter Galvanized 36" Pipe Length is a component that is used in a typical venting installation. The Duravent 36" direct vent pipe is designed for appliances tested and listed for direct vent. Features a fully unitized twist-lock construction in both 4"x6-5/8" and 5"x8" vent sizes. Use of sealant is optional, unless specified by the appliance manufacturer. To calculate install length, subtract 1 1/2” for each joint. No beads or hems. Features:For gas stove or fireplace venting4"ID x 6-5/8"OD x 36" lengthTwist lock constructionExterior laser welded seamsFor use with direct vent appliances vented horizontally or verticallyDirectVent 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.