8" DuraTech Stainless Steel Chimney Adaptor with Trim 8DVL-ADC This chimney adaptor with trim is used to connect from double-wall DVL and/or single-wall DuraBlack to DuraTech DuraPlus and DuraLiner for a through-the-wall or ceiling support installation. Required for proper connection. Approved for most fuel types 430-alloy stainless steel inner wall 2" clearance to combustibles ThermalTech blanket insulation eliminates hot spots Twist-lock connections for strong secure fits Able to vent large fireplaces and building heating appliances Clean smooth exterior finish .016” stainless steel inner wall. .018” galvanized outer painted black.