The McCormick 6678303A1 is a genuine OEM O-Ring designed for various McCormick CX series tractors, including models CX100, CX105, CX110, CX115, CX70, CX75, CX80, CX85, CX90, and CX95. This high-quality O-ring provides a critical seal, preventing leaks and maintaining system integrity in demanding agricultural applications. With an inner diameter of 63.5 mm and a thickness of 3.5 mm, it ensures precise fitment and optimal performance.