The McCormick 378287X1 is a genuine OEM piston ring designed for optimal engine performance and durability in various McCormick, Case IH, and International Harvester tractor models. This compression ring ensures proper cylinder sealing, critical for maintaining engine compression and efficiency. It is a direct replacement part, ensuring a precise fit and reliable operation for models including B275, B414, 434, 444, 354, 374, 384, and 276.