Genuine OEM Hyundai Diesel Fuel Cap, part number 3101025400. This essential cap securely seals the fuel filler neck, preventing the entry of dirt, debris, and moisture into the fuel tank, while also preventing fuel evaporation. It is specifically designed for diesel vehicles, clearly marked 'DIESEL' to prevent misfuelling, and includes an integrated tether to prevent loss. Constructed from durable, fuel-resistant plastic, it ensures a tight seal and long-lasting performance. Choosing a genuine OEM fuel cap guarantees a perfect seal, correct pressure relief (if applicable), and material compatibility with diesel fuel, crucial for fuel system safety and efficiency.