FMI/Superior Wood Fireplace Firestop Thimble for 12 Inch Chimney Pipe. Only FMI/Superior Chimney Wood Fireplace Chimney Liners and Chimney Liner Accessories are approved for use with FMI/Superior Wood Fireplaces. They are UL approved and are not for use with any product other than FMI/Superior Wood Burning Fireplaces.
- Firestop Thimble
- For use with FMI or Superior 12 Inch Chimney