Genuine OEM Volkswagen V-Belt Pulley, part number 027121028. This pulley is mounted to the engine's crankshaft and is responsible for driving various accessories such as the water pump and alternator through the V-belt. It is a crucial component for the engine's accessory drive system, ensuring proper operation of cooling and charging systems. The pulley weighs 0.84 kg. Genuine OEM pulleys are manufactured to exact tolerances for proper balance and to prevent premature wear on belts and bearings.