The McCormick 6621565A1 is a genuine OEM hydraulic valve designed for various McCormick X-series agricultural tractors. This essential component ensures proper hydraulic system functionality and is compatible with models including X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.80, X4.90, X4.100, X4.110, X4.120, X5.35, X5.45, X5.55, X5.65, X5.75, X5.85, X5.95, X5.105, X5.115, X5.125, X6.420, X6.430, X6.440, X7.440, X7.450, X7.460, X7.650, X7.660, X7.670, X7.680, X8.660, X8.670, and X8.680.