Genuine OEM Volkswagen Windshield Washer Reservoir Tank, part number 3C8955453B. This component is responsible for holding the windshield washer fluid, which is then pumped to the washer jets for cleaning the windshield. It is typically located in the engine bay. Constructed from durable, translucent plastic, it allows for easy visual inspection of fluid levels. Using a genuine OEM reservoir ensures proper fitment, leak-free operation, and chemical resistance to washer fluids, maintaining the integrity of the washing system.