The McCormick 356578X1 radiator cap is an essential OEM replacement part designed to maintain the correct pressure within the cooling system of various International Harvester and McCormick tractor models. This cap prevents coolant loss and ensures efficient engine operation, contributing to the longevity and reliability of your agricultural machinery. It is compatible with a wide range of models including the B250, B275, B414, 434, 444, 354, 374, 384, 454, 474, 475, 574, 674, 774, 884, 2400, 2500, 3434, and 3500 series.