1. Product features - The cap for the windshield washer fluid reservoir directly replaces a torn or lost cap. - An essential part of vehicle modification and maintenance. - The markings on the cap help you quickly locate the windshield washer fluid reservoir. 2. Product material - Made from special materials that are rust resistant, heat resistant, and wear resistant. - Easy to clean. - Professionally designed to replace the old windshield washer fluid reservoir cap. - You can buy with confidence. 3. Product installation - Installable without any extra tools. - Simply remove the old or damaged cap and fit this cap onto the windshield washer fluid reservoir. - Please ensure the cap seals properly. 4. Function - The radiator cap ensures a seal under normal conditions and helps prevent coolant leaks. 5. Use scenarios - Scenario 1: Replacing a torn or lost cap on a daily driver to restore proper reservoir access and prevent contamination. - Scenario 2: Spare replacement during maintenance on older vehicles with brittle or missing caps. - Scenario 3: Vehicle modification or restoration projects that require a reliable, easy to install cap to maintain reservoir integrity.