Genuine OEM Audi Engine Cooling O-Ring, part number 059121149E. This sealing ring is a critical component designed to create a tight, leak-proof seal between engine cooling system flanges. It prevents coolant loss and maintains optimal system pressure. Made from durable, heat-resistant elastomer, it weighs only 0.0014 kg. Using a genuine OEM O-ring ensures precise dimensions and material composition, guaranteeing long-term sealing integrity and resistance to thermal cycling and chemical degradation.