This is a genuine JCB part number 30925961, an original equipment manufacturer (OEM) seal designed for optimal performance and durability. It is compatible with a wide range of JCB machinery, including 3CX, 4CX, 5CX backhoe loaders, and numerous JS series excavators such as JS130, JS140, JS160, JS180, JS200, JS220, JS240, JS260, JS300, JS330, JS360, JS370, JS460, JS480, JS500, JS520, JS530, JS550. This seal ensures a tight fit and prevents leaks in critical hydraulic or mechanical systems.