Genuine OEM Audi Fuel Filler Neck Locking Ring, part number 4M0201115A. This essential component is designed to securely hold the fuel filler neck in place, preventing movement and ensuring a proper seal within the fuel system. It is a very lightweight part, weighing approximately 0.014 kg. Using a genuine OEM locking ring guarantees precise dimensions and material quality, which is crucial for maintaining the integrity of the fuel system and preventing leaks or disconnections.