Genuine OEM Volkswagen Cylinder Block Rear Sealing Flange, part number 03H103173B. This flange is mounted at the rear of the engine's cylinder block, providing a crucial seal to prevent oil leaks and maintain engine lubrication. It is an integral component for the long-term integrity and performance of the engine. Weighing 1.205 kg and measuring 0.325m in length, this flange is a substantial engine component. Using a genuine OEM sealing flange ensures precise dimensions, correct material composition, and optimal sealing properties, preventing costly engine damage from fluid loss.