The Case IH 662066R91 is a genuine OEM oil seal designed for a wide range of International Harvester (IH) tractors, combines, and industrial equipment. This precision-engineered seal features an inside diameter of 38.1 mm, an outside diameter of 57.15 mm, and a width of 9.525 mm, providing a critical barrier against fluid leakage and contamination. It is essential for maintaining optimal lubrication and protecting internal components in various IH models, including popular series like the 240, 300, 404, 504, 656, 706, 806, 966, 1066, 1466, and many others.