Genuine OEM Volkswagen Fuel System Cap, part number 06F133335A. This small, durable plastic cap is designed to seal and protect a port within the fuel system, such as a fuel pressure test port or a component of the fuel pump assembly. It prevents the ingress of dirt, moisture, and other contaminants, maintaining system integrity. Weighing only 0.002 kg, this cap provides a secure fit. Choosing a genuine OEM cap ensures the correct thread, material, and sealing properties for long-term reliability in the fuel system.