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A gasket is a simple yet crucial sealing component used in boilers, burners, and other heating equipment to prevent leaks of water, gas, or combustion products. It is typically placed between flanges, covers, or joints to create a tight seal. Over time, gaskets can degrade due to heat and pressure, leading to potential leaks and efficiency loss. Replacing worn gaskets during routine maintenance is a cost-effective way to maintain system integrity and safety.