Genuine OEM Volkswagen O-Ring, part number N90806302. This O-ring creates a seal to prevent fluid or gas leakage in various engine and cooling system components. It is located at position 8 in the diagram. The O-ring has a diameter of 0.035 m and a thickness of 0.003 m. Genuine OEM O-rings are made from high-quality materials with precise tolerances to ensure a reliable seal and prevent leaks under various operating conditions.