This is a genuine JCB O-Ring, part number 25220777 (also known as 25/220777), engineered for reliable sealing in a wide array of JCB agricultural and construction machinery. It features an internal diameter of 101.2 mm and a section diameter of 5.33 mm, ensuring a precise and secure fit. This O-Ring is a critical component for hydraulic systems and other sealing applications across JCB Loadall, Fastrac, JS Excavator, Backhoe Loader, Wheeled Loader, Telescopic Handler, Skid Steer Loader, Teletruk, and Rough Terrain Forklift models.