The AS568-387 SIMRIZ SZ481 is engineered for optimal sealing performance with an 18" inner diameter and an 18-3/8" outer diameter, featuring a thickness of 3/16". This product from Freudenberg-NOK is crafted from high-quality SIMRIZ material, providing exceptional resistance to various chemicals and environmental conditions. It is ideal for use in large-scale industrial applications, ensuring a reliable seal that meets stringent industry standards. The SZ481 is designed to withstand high pressures and temperatures, making it a versatile choice for hydraulic and pneumatic systems.