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The flue hood gasket is a critical sealing component that prevents flue gas leakage where the hood connects to the boiler. This white gasket is designed to withstand thermal expansion and maintain a secure seal over time. Replacing a worn or damaged flue hood gasket is a straightforward yet important step in boiler maintenance, helping to ensure proper venting and efficient operation. Using the correct gasket for your flue hood helps avoid dangerous carbon monoxide leaks and keeps your heating system running safely.