The 62AS568-390 Z7257 O-Ring from Freudenberg-NOK is a high-quality sealing solution with a 21" ID, 21-3/8" OD, and 3/16" thickness. Made from SIMRIZ material, this O-ring offers excellent resistance to chemicals and high temperatures, making it suitable for various industrial applications. Its precise dimensions ensure a secure fit, preventing leaks and enhancing the efficiency of your systems. This O-ring complies with industry standards, ensuring reliability and durability in demanding environments. Choose this O-ring for its proven performance and longevity.