Description DSP6E9-1, 6", Black Matte Outer Finish, 90 Degree Elbow, Stainless Steel Inner Lining Smoke/Stove Pipe, Used to Offset Double Wall Stove Pipe Toward Insulated Chimney. Double Wall Smoke Pipe Was Designed to work with your Stainless Steel Chimney to form a complete Wood Stove Venting System Lifetime Warranty Heavy Gauge 400 series Inner Liner Stainless Steel/Aluminized Steel Outer Used to offset Double Wall Stove Pipe toward insulated chimney in a thru-the-wall installation - Non-positional connection system allows 360° rotation Underwriters Laboratories ULC S641/UL 103 Certified System requires only 6 inches to combustible versus 18 inches for single wall pipe Better Insulating Value Advanced Design = Easy Installation Check Appliance Installation Instructions for Details