The AS568-464 17 1/2" ID x 18" OD x 1/4" SIMRIZ SZ501 O-ring by Freudenberg-NOK is engineered for high-performance sealing in industrial environments. Constructed from premium SIMRIZ material, this O-ring offers outstanding resistance to chemicals and high temperatures. With precise dimensions of 17.5 inches inner diameter and 18 inches outer diameter, it complies with AS568 specifications, ensuring compatibility with various systems. The 1/4 inch thickness provides a robust seal, preventing leaks and maintaining system integrity. This product meets rigorous industry standards for quality and reliability.