Replace a damaged or poorly sealing flue collar on your Hi-Flame Olymberyl Maximus (HF446) with this genuine spare. The Olymberyl Maximus Top Flue Collar is the cast iron connector between the stove and flue pipe, and a good seal at this junction is essential for safe operation. This replacement is made to the original specification and fits the Olymberyl Maximus flue outlet directly.