Key benefits Restores a watertight seal for the windshield washer reservoir to prevent fluid evaporation and leaks. Durable plastic construction resists impact, weathering, and temperature changes to reduce cracking or deformation over time. Simple snapon fit and integrated gasket make replacement fast and tool, so your washer system stays ready when you need it. What this part does Replaces the worn or missing washer fluid reservoir cover to protect the reservoir from dust, moisture, and contaminants. The blue cap maintains a proper seal that helps keep washer fluid from leaking or evaporating, supporting consistent washer performance. Features and materials Material: Sturdy plastic engineered to withstand impact, UV exposure, and temperature fluctuations. Seal: Builtin gasket provides a reliable seal against dust and moisture intrusion. Installation: Snapon design requires no tools or modifications; press firmly until seated. Practical applications / use scenarios Afterservice replacement: a damaged or lost cap following routine maintenance or windshield washer system . Winter protection: Prevents moisture and road salt from entering the reservoir during cold months, reducing the risk of contamination or freezerelated issues. Long trips or daily driving: Keeps washer fluid where it belongs so you can clear the windshield when visibility is reduced by bugs, dirt, or road spray. Compatibility and fit Compatible with: Porsche Cayenne 2003–2018 and Porsche Macan 2015–2024. Replaces part number: 3Q0955455. Always verify your vehicle's model and year before to ensure correct fit. Installation notes Remove the old cap, align this cap with the reservoir opening, and press firmly until it snaps into place. No tools or additional parts required. Ensure the integrated gasket seats fully to achieve a proper seal.