Genuine OEM Volkswagen Activated Charcoal Canister, part number 4M4201799A. This canister houses activated charcoal to capture fuel vapors from the fuel tank, reducing evaporative emissions. It is part of the emissions control system, indicated by position 1 on the diagram. Constructed with high-quality adsorbent material for effective vapor capture. Genuine OEM canisters ensure proper airflow and vapor absorption for effective emission control.