The 021 Viton O-Ring with 90 durometer from SSP Fittings Corp is engineered for high-performance sealing in demanding environments. This O-ring is made from Viton, known for its excellent resistance to heat, chemicals, and pressure. With a size of 021, it is ideal for use in hydraulic and pneumatic applications where reliability is crucial. Its 90 durometer rating ensures a firm seal, preventing leaks and maintaining system efficiency. This O-ring is a must-have for any professional looking to enhance the performance of their systems.