The John Deere RE545631 is an authentic OEM fuel water sensor designed to accurately detect water in the fuel system of a wide range of John Deere agricultural and industrial machinery. This vital component is compatible with numerous models, including 6R, 7R, 8R, and 9R Series Tractors, as well as S-Series Combines and R-Series Sprayers. By providing early detection of water contamination, the sensor helps prevent costly damage to fuel injectors, pumps, and other critical engine components, ensuring optimal engine performance and longevity. It supersedes part numbers RE529119, RE522878, and RE520953, reflecting the latest design and manufacturing standards from John Deere.