The McCormick 6602059A3 RESERVOIR is a genuine OEM replacement part designed for various McCormick X-series tractors. This essential component ensures proper fluid containment and system operation across models including X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.80, X4.90, X5.20, X5.30, X5.40, X5.50, X5.60, X5.70, X5.80, X5.90, X6.420, X6.430, X6.440, X6.450, X6.460, X6.470, X6.480, X6.490, X7.440, X7.450, X7.460, X7.470, X7.480, X7.490, X7.650, X7.660, X7.670, X7.680, X7.690, X8.660, X8.670, X8.680, and X8.690.