6" DuraVent DuraPlus Through-The-Wall Kit 6DP-KTTW This through-the-wall kit includes: DVL and DuraBlack chimney adaptor for a secure connection snap-lock adaptor with trim 9" DuraPlus chimney pipe wall thimble tee with clean-out cap (2) wall straps tee support bracket and chimney cap to keep out water and debris from your chimney liner. Use for through-the-wall installations. Use when air-cooled chimney is required Free-floating inner 430-alloy liner maintains structural integrity in chimney fires 2" clearance to combustibles Outer diameter is 4" larger than inner diameter Triple-wall chimney For uses with wood stoves fireplaces furnaces boilers stoves ranges water heaters or other appliances fueled by wood oil coal or gas Clean smooth exterior finish .016†430 stainless steel outer wall or .018†galvanized steel outer wall. .018†aluminized steel intermediate liner. .016†430 stainless steel inner liner. Insulated layers plus ventilated air space. Locks tightly with a precision twist-lock connection.