Imperial Adjustable Flue Stopper (4″ to 8″ Openings): BM0026
Replace Part # BM0026. flue hole. It will adjusts to fit 4″, 6″, 7″, and 8″ flue wall openings. Has adjustable anchors to keep the stopper securely in place. Used to cover existing flue hole from 4″ to 8″.