The McCormick 137777C1 is a genuine piston ring designed for a wide range of McCormick and International Harvester tractors. This essential engine component ensures proper compression and oil control, contributing to optimal engine performance and longevity. It is a direct replacement for the original part, fitting models such as B275, B414, 354, 374, 384, 434, 444, 276, 454, 474, 475, 574, 674, 784, 884, 984, 3210, 3220, 3230, 3240, 4210, 4220, 4230, 4240, 956XL, 1056XL, 1255XL, 1455XL, 844XL, 744, 644, 544, 485, 585, 685, 785, 885, 995, 395, 495, 595, 695, 795, 895, 995.