The AS568-470 21" ID x 21 1/2" OD x 1/4" SIMRIZ SZ134 O-ring from Freudenberg-NOK is engineered for superior sealing performance in demanding environments. Constructed from high-quality SIMRIZ material, this O-ring offers exceptional resistance to chemicals and temperature fluctuations. With precise dimensions of 21 inches inner diameter and 21.5 inches outer diameter, it adheres to AS568 standards, ensuring a perfect fit for various applications. The 1/4" thickness enhances its sealing capabilities, making it suitable for both hydraulic and pneumatic systems, while its compliance with industry standards guarantees reliability and durability.