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An O-ring is a simple yet essential seal used in many boiler and burner components to prevent leaks of water, gas, or air. This circular rubber ring fits into grooves and compresses between mating surfaces, creating a tight seal. Over time, O-rings can dry out, crack, or become misshapen, leading to leaks and reduced efficiency. Replacing worn O-rings during routine boiler maintenance is a cost-effective way to keep your system running smoothly. This O-ring is suitable for various applications within heating equipment.