8" DuraVent DVL Chimney Adaptor with Trim 8DVL-ADT This chimney adaptor with trim is used to connect from double-wall DVL to DuraTech DuraPlus and DuraLiner for a through-the-wall or ceiling support installation. Required for proper connection. Provides a strong mechanical connection. Adaptor will work with all 6" - 8" DuraPlus and 7" - 8" DuraTech installations. Adaptor will work with 5" - 6" DuraTech Ceiling Support Box installations only. Use with DuraVent factory-built chimneys 430-alloy stainless inner wall aluminized steel outer wall 1" outer diameter Reduces clearances from 18" to 6" for walls Reduces clearances from 18" to 8" for ceilings Sturdy construction to ensure long-lasting durability Creates a tight secure connection in your venting system .016†stainless steel inner wall. .018†galvanized outer painted black.