Genuine OEM Volkswagen Fuel Cap, part number 4G0201550L. This cap is designed to cover and protect the fuel filler opening, preventing fuel evaporation and contamination while maintaining system pressure. It is a black plastic cap, featuring an integrated tether to prevent loss, and weighs approximately 0.0726 kg. Choosing genuine OEM ensures proper sealing and material compatibility with fuel, critical for emissions control and fuel system integrity.