The John Deere Z79597 is a genuine OEM O-Ring designed to provide a secure and leak-free seal in numerous John Deere agricultural and utility equipment applications. With an inner diameter of 28.17 mm, an outer diameter of 32.54 mm, and a thickness of 2.18 mm, this O-Ring is critical for maintaining system integrity in hydraulic, fuel, and other fluid circuits. It is a direct replacement part, ensuring proper fit and performance across a wide range of John Deere tractor models including those in the 1, 2, 3, 4, 5, 6, 7, 8, and 9 Series, as well as combines, sprayers, and forage harvesters.