The 3661272M91 is a genuine OEM radiator cap designed for various agricultural machinery, primarily Massey Ferguson, Landini, and McCormick tractors. This essential cooling system component maintains optimal pressure within the radiator at 0.9 bar, preventing coolant boil-over and ensuring efficient engine temperature regulation. Manufactured to precise specifications, it features a diameter of 57 mm and a height of 25 mm, guaranteeing a secure and leak-free fit. This high-quality cap is crucial for the longevity and performance of your tractor's cooling system.