Genuine OEM Volkswagen Bung, part number 03H103037. This bung seals openings in the engine crankcase or oil sump to prevent oil leakage. It is a small but vital component for maintaining the integrity of the engine's lubrication system. Located in the engine block or oil pan. Typically made of metal or durable plastic. Genuine OEM bungs provide a precise fit and reliable seal to prevent oil loss.