The 3665018M1 is an authentic OEM fuel tank cap, designed to provide a secure and sealed closure for the fuel tank on a wide range of agricultural machinery. This essential component prevents fuel contamination and spillage, ensuring optimal performance and safety. It is compatible with numerous McCormick tractor models, including the X4, X5, X6, X7, and X8 series, as well as various Massey Ferguson tractor series such as the 2600, 4700, 5700, 6700, 7700, and 8700.