This genuine McCormick 3663960M1 radiator cap is designed to maintain optimal cooling system pressure at 0.9 bar (13 PSI) for a wide range of McCormick CX, MC, MTX, X60, X70, and XTX series tractors. It ensures proper engine temperature regulation and prevents coolant loss, crucial for the longevity and performance of your agricultural machinery. This OEM quality cap is also compatible with numerous Massey Ferguson, Challenger, Fendt, and Valtra tractor models, offering reliable fitment and performance.