The McCormick 6681945A1 is an OEM fuel filter designed to provide optimal fuel filtration for various McCormick X-series agricultural tractors. This genuine replacement part ensures protection against contaminants, maintaining engine performance and longevity. It is compatible with models including X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.35, X4.45, X4.55, X4.65, X4.75, X5.35, X5.45, X5.55, X5.65, X5.75, X6.420, X6.430, X6.440, X6.460, X7.440, X7.450, X7.460, X7.650, X7.660, X7.670, X7.680, X8.660, X8.670, and X8.680.