Genuine OEM Peugeot Window Washer Reservoir, part number 9841404280. This part serves as the storage tank for windshield washer fluid, which is then pumped to the washer nozzles to clean the windshield. It is typically located in the engine bay, often near the front of the vehicle. The reservoir is made of durable plastic and includes a cap for refilling. Using a genuine OEM reservoir ensures proper fitment and material integrity for long-term use.