The McCormick 3650923M91 is a genuine tank cap designed for various McCormick tractor models, including the X4, X5, X6, X7, and X8 series. This cap ensures a secure seal for fuel or hydraulic tanks, preventing contamination and spills. It is also compatible with a wide range of Landini, Massey Ferguson, Fendt, and Valtra machinery, serving as a direct replacement for the original part. Features an outer diameter of 70mm and an inner diameter of 60mm.