The John Deere RE521196 is a genuine OEM fuel filter designed to provide superior filtration for a wide range of John Deere engines and machinery. This essential component effectively removes contaminants from the fuel system, protecting critical engine components and ensuring reliable operation. It is a direct replacement for several earlier John Deere part numbers, including RE509031, RE507204, RE500186, RE504836, and RE504837, making it a versatile and critical maintenance part for many John Deere agricultural and construction applications. Regular replacement of the fuel filter helps maintain engine efficiency and longevity.