Genuine OEM Volkswagen Clutch Master Cylinder, part number 2E0721401C. This critical hydraulic component converts the mechanical force from the clutch pedal into hydraulic pressure, which then actuates the clutch slave cylinder. It is an integral part of the clutch's hydraulic control system. Constructed with a durable plastic body and a metal pushrod, it weighs approximately 0.17 kg. Choosing a genuine OEM master cylinder ensures precise fluid displacement, correct pressure output, and reliable clutch operation for optimal driving performance.