M&G DuraVent 7" DuraBlack Damper Section - 7DBK-DS DuraBlack is a single-wall interior stovepipe for connecting woodstoves to a manufactured chimney. This is a 5'' long pipe section with the damper conveniently pre-installed. Install at or as close to the stove outlet in-line as possible. Constructed of 24 gauge steel Manufacturer's Limited Lifetime Warranty