The McCormick 6678651A1 plunger is a genuine OEM component designed for various agricultural machinery. This essential part ensures proper function within compatible McCormick X4 series tractors, including models X4.20, X4.30, X4.40, X4.50, X4.60, X4.70, X4.75, X4.80, X4.90, X4.100, X4.110, X4.120. It also fits a wide range of Case IH JX series, New Holland TD and T4 series, and Steyr Kompakt tractors, providing reliable performance and precise operation.