Genuine OEM Volkswagen Clutch Master Cylinder, part number 3C0721388P. This critical component converts the mechanical force from the clutch pedal into hydraulic pressure, which then actuates the clutch for smooth engagement and disengagement. Weighing 0.159 kg, this master cylinder is engineered for precise fluid displacement and pressure control. Choosing a genuine OEM clutch master cylinder ensures correct hydraulic calibration and material compatibility, vital for consistent clutch operation and transmission longevity.