The JCB 336B3020 is a genuine OEM O-Ring designed for various JCB machinery, including 3CX and 4CX backhoe loaders, JS series excavators, and 500 series telehandlers. This essential sealing component ensures a secure and leak-free connection in hydraulic and fluid systems, maintaining optimal machine performance. It features an internal diameter of 28.2 mm, an external diameter of 34.2 mm, and a thickness of 3 mm, providing a precise fit for specified applications.