The McCormick 4220797M91 Master Cylinder is a genuine OEM replacement part designed for various McCormick CX series tractors, including CX50, CX60, CX70, CX75, CX80, CX85, CX90, CX95, CX100, CX105, and CX110. This essential component ensures reliable brake system operation. It is also compatible with Massey Ferguson 3300 series and Valtra A series tractors, offering broad application across AGCO brands. Weighing approximately 0.80 kg, this master cylinder is built to OEM specifications for optimal performance and durability.