The McCormick 6503990M1 is a genuine OEM radiator cap designed for various McCormick tractor models, including the C, CX, MC, MTX, T, V, X4, X5, X6, X7, and XTX series. This essential cooling system component maintains a pressure of 0.7 bar, preventing coolant boil-over and ensuring efficient engine temperature regulation. With an outer diameter of 60mm, an inner diameter of 45mm, and a height of 30mm, it provides a precise fit and reliable performance for your agricultural machinery.