Genuine OEM Volkswagen Nut, part number N90886602. This nut is specifically designed to secure exhaust components, ensuring a tight and leak-free seal. Its precise threading and material composition are engineered to withstand the high temperatures and vibrations typical of exhaust systems. Proper installation with genuine OEM nuts is crucial for preventing exhaust leaks and maintaining optimal system performance. The nut is located at position 7 on the diagram.