Genuine OEM Audi Windscreen Washer Fluid Reservoir Cap, part number 400955277. This cap is designed to securely seal the windscreen washer fluid reservoir, preventing contamination of the fluid and evaporation. It ensures the washer system remains clean and functional. Weighing only 0.0059 kg, this cap is made from durable plastic and often includes an integrated tether. Using a genuine OEM cap ensures a perfect seal, resistance to washer fluid chemicals, and long-term reliability for the washer system.