DVL Collection 8″ Double Wall DVL / Single Wall DuraBlack Chimney Adapter The DVL 8″ Double Wall DVL / Single Wall DuraBlack Chimney Adapter is a component that is used in a typical venting installation. Use 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 …