Genuine OEM Volkswagen Hexagon Socket Bolt, part number N91196201. This fastener is used to secure piping within the engine intake and emissions assembly, ensuring components remain tightly sealed under thermal stress. The hexagonal socket head allows for high torque application in confined spaces. It features a specialized finish to resist corrosion in high-temperature environments. Using genuine OEM hardware ensures the correct metallurgy and thread tolerances, preventing loosening due to engine vibration and heat cycles.