The AS568-470 21" ID x 21 1/2" OD x 1/4" SIMRIZ SZ481 by Freudenberg-NOK is a high-performance sealing solution designed for industrial applications. This O-ring features a durable SIMRIZ material, ensuring excellent resistance to various chemicals and temperatures. With an inner diameter of 21 inches and an outer diameter of 21.5 inches, it fits perfectly in standard AS568 specifications. The 1/4" thickness provides a robust seal, making it ideal for hydraulic and pneumatic systems. This product meets industry standards for quality and reliability, ensuring compatibility with a wide range of systems.