The DuraVent DuraBlack Increaser with Trim, 6 to 8-Inches provides a premium product for use with the DuraBlack chimney system. This DuraBlack Slip Increaser with Trim adapts from 6-inch DuraBlack to 8-inch DuraTech, DuraPlus, DuraTech Premium, or DuraLiner at the ceilinges or finishing collar and adds 5 inches to 15 inches of length.

DuraBlack offers an economical, drip free, single-wall stovepipe. Built to DuraVent's high standards, DuraBlack is constructed with die-formed end fittings. Adjustable pipe lengths also eliminate the need for cutting and crimping. Available in 24-gauge lock-seam, 22-guage stainless steel and heavy-duty 22-guage welded seam, DuraBlack offers a durable venting option for the home.