The AS568-469 20" ID x 20 1/2" OD x 1/4" SIMRIZ SZ481 O-ring by Freudenberg-NOK is a premium sealing solution designed for industrial applications. This O-ring is made from high-performance SIMRIZ material, providing excellent resistance to a variety of chemicals and temperature extremes. With an inner diameter of 20 inches and an outer diameter of 20.5 inches, it meets AS568 specifications, ensuring compatibility with standard fittings. The 1/4" thickness offers a reliable seal, making it ideal for hydraulic and pneumatic systems, while its adherence to industry standards ensures long-lasting performance.