The McCormick 3673383M2 is a genuine OEM radiator cap designed to maintain the correct pressure within the cooling system of McCormick and Massey Ferguson agricultural tractors. This essential component helps prevent coolant boil-over and ensures efficient engine cooling. It is compatible with a wide range of MC and MF series models, including MF 3000, 4200, 4300, 5400, 6100, 6200, 6400, 7400, 8100, 8200, 8400, and 8600 series, as well as McCormick MC series tractors.