Washer Reservoir Cap — Compatible with A4L / A5 B9 (2017–2020) — Part No. 8W0955455B Key benefits Restores a secure, leak seal for your windshield washer fluid reservoir to prevent fluid loss and contamination. Durable ABS construction resists rust and corrosion for reliable longterm performance. Direct fit for A4L and A5 B9 models (2017–2020) — straightforward replacement using the original part number 8W0955455B. What this cap does for you Stops washer fluid leaks that can lead to low fluid warnings or reduced washer performance. Keeps dirt and moisture out of the reservoir, protecting the pump and nozzles from premature wear. Offers a longlasting replacement option that matches the reservoir connection on compatible vehicles. Features and specifications Compatibility: A4L, A5 B9 model years 2017–2020. Part number: 8W0955455B (matches original replacement specification). Material: quality ABS plastic — corrosion and rustresistant for extended service life. Installation: Tool, manual installation. Fit and press into place until fully seated; verify the cap is properly fitted and sealed to prevent leakage. Typical use scenarios a cracked or missing cap after an impact or enginebay service. Routine maintenance to eliminate slow leaks and ensure washer system reliability before seasonal travel. Preventative replacement when servicing the washer pump or refilling fluid to avoid introducing contaminants. Fitment note Designed as a direct replacement for the listed models and part number. Confirm compatibility with your vehicle's model year and reservoir connection before . Simple, durable, and easy to install — a practical replacement to keep your windshield washer system working reliably.