The AS568-390 O-ring features a 21" inner diameter and a 21-3/8" outer diameter with a thickness of 3/16". Manufactured by Freudenberg-NOK, this SIMRIZ SZ134 O-ring is designed for high-performance sealing applications. It is made from durable materials that ensure longevity and reliability in various environments. This O-ring meets industry standards for quality and performance, making it suitable for a wide range of applications, including hydraulic and pneumatic systems. Its precise dimensions and robust construction provide excellent sealing capabilities, preventing leaks and ensuring optimal operation.