The JCB 25221510 is a genuine OEM back-up ring designed for use in various JCB machinery hydraulic systems. This critical component prevents extrusion of O-rings and other seals under high pressure, enhancing the longevity and reliability of hydraulic cylinders and components. Manufactured to JCB's stringent quality standards, it ensures a precise fit and robust performance in demanding agricultural and construction applications. This back-up ring is essential for maintaining hydraulic system integrity and preventing fluid leaks.