Genuine OEM Volkswagen Clutch Master Cylinder, part number 7E0721401E. This essential hydraulic component is responsible for converting the mechanical force from the clutch pedal into hydraulic pressure. This pressure is then transmitted to the slave cylinder, enabling smooth and precise clutch engagement and disengagement. Constructed from durable plastic and rubber components, it weighs approximately 0.164 kg and measures 0.215 meters in length. Installing a genuine OEM clutch master cylinder ensures correct hydraulic pressure, reliable clutch operation, and optimal pedal feel, critical for the vehicle's transmission system.