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The flue nozzle gasket is a sealing component used in boiler and burner systems to prevent gas leaks at the flue connection point. This gasket ensures a tight seal between the flue nozzle and the boiler, which is essential for safe and efficient operation. Over time, gaskets can degrade due to heat and pressure, so replacing them during routine maintenance helps maintain system integrity. Using the correct gasket type is important for compatibility and performance.