The McCormick 6660561A1 is a genuine OEM O-Ring designed for critical sealing applications in McCormick agricultural machinery, including various MC and MTX series tractors. Measuring 50.4 mm in inner diameter and 3.53 mm in section diameter, this high-quality sealing component ensures a reliable, leak-free seal, maintaining the integrity and performance of hydraulic or fluid systems. It is also an equivalent to Case IH, New Holland, and Steyr part number 87304194.