O-ring 21 X 3.5 EPDM (10 ps) De Dietrich 721680900

The O-Ring 21 X 3.5 Epdm is a robust sealing component designed for larger connections in boiler and burner assemblies. Measuring 21mm inner diameter with a 3.5mm cross-section, this EPDM O-ring ensures a tight seal against water, steam, and gas. Its material properties make it suitable for high-temperature environments in heating equipment. When servicing gas burner parts or performing boiler maintenance, this O-ring is a reliable choice for replacing worn seals and maintaining system efficiency.