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The rubber grommet is a versatile protective component used in heating equipment to cushion and seal passages where wires or tubes pass through metal panels. It prevents abrasion, vibration damage, and moisture ingress, extending the life of cables and hoses. Over time, rubber grommets can become brittle or crack, leading to potential electrical or fluid leaks. Replacing them is a simple yet effective way to maintain the integrity of your boiler or burner system during routine maintenance.