Genuine OEM Volkswagen Reducing Medium Tank Cover, part number 2E0201192. This cover is designed to protect the reducing medium (e.g., AdBlue/DEF) reservoir from contaminants and damage. It is positioned over the top of the reducing medium tank. Weighing approximately 0.346 kg and measuring 0.19 meters in length, this cover is typically made from durable plastic. Choosing a genuine OEM tank cover ensures a precise fit and proper sealing, preventing ingress of dirt or moisture into the emissions fluid, which is critical for system longevity and performance.