RE230985 is a genuine John Deere secondary (inner) engine air filter element, specified in John Deere's official 9R Series filter guide as the secondary air filter for the 9410R and 9510R tractors, paired with the primary filter RE312946 . It is an oval-shaped paper element that installs inside the primary outer filter, serving as the final safety barrier against dust and abrasive contaminants reaching the engine.
