The John Deere R183409 is a genuine OEM round cross section O-Ring designed for sealing applications in a wide range of John Deere equipment. This O-ring features an inside diameter of 15.6 mm (0.614 inches) and a cross-section thickness of 2.62 mm (0.103 inches), with an outside diameter of 20.84 mm (0.820 inches). It ensures a reliable seal against fluid leaks and is critical for maintaining system integrity in hydraulic, engine, and transmission components across John Deere tractors, combines, sprayers, and construction machinery.