The 3669382M91 is a genuine OEM radiator cap designed for McCormick, Massey Ferguson, Fendt, Valtra, Landini, Challenger, and Laverda agricultural machinery. This essential component maintains the correct pressure within the cooling system, rated at 0.9 bar (13 PSI), preventing coolant boil-over and ensuring optimal engine temperature regulation. It is a direct replacement part, critical for the efficient operation and longevity of your tractor's cooling system.