DuraVent DuraTech All-Fuel Adjustable Galvanized Chimney Pipe Wall Strap - For 12-Inch Inner Diameter DuraTech: A venting pipe with an inner diameter of 12" is required for this unit. DuraTech understands that installing a fireplace without having to make some form of supply adjustment is merely a pipe dream. They designed their All-Fuel Adjustable Galvanized Chimney Pipe Wall Strap to function in this role in order to make this endeavor viable. It's meant to be used with Chimney Pipes that have a 12" inner diameter, although it may be modified as well, as the name suggests.

Supports and stabilizes chimney pipes Adjusts 2" to 6" Galvanized steel construction For use with 12" DuraTech chimney pipes Limited lifetime warranty