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A seal gasket is a vital component used to create a tight seal between mating surfaces in boiler and burner assemblies, preventing leaks of gas, water, or combustion products. It is typically made from materials like rubber, silicone, or fiber that can withstand high temperatures and pressures. Proper sealing is critical for safety and efficiency in heating systems. Replacing a worn or deteriorated seal gasket helps maintain system integrity and prevents potential hazards.