O-ring 29x3 De Dietrich 7621694

An O-ring with dimensions 29x3 mm is a small but critical sealing element used in many boiler and burner components. It fits into grooves to prevent leaks between mating parts, such as in pump housings, valve stems, or pipe connections. Made from durable elastomer, it withstands heat, pressure, and exposure to various fluids. Replacing worn O-rings during routine maintenance can restore system integrity and prevent costly failures. This size is common in heating equipment, making it a useful spare part to have on hand.