Material: ABS plastic for durability and resistance to damage, built to provide long service life. Key benefits Reliable seal and fluid retention: tight seal keeps washer fluid in the reservoir, helping ensure the washer system is ready when you need it and reducing the risk of leaks. Tool installation: simply the cap on the cleaning fluid reservoir without tools; ensure the gasket forms a solid seal to prevent leaks. Clear reservoir identification: distinctive markings on the cap help you quickly locate the reservoir during maintenance or refills. Primary function reliability: seals the water reservoir to prevent leakage and protect washer fluid integrity during use. What it does Seals the windshield washer fluid reservoir to prevent leaks and fluid loss. Features a gasket for an effective seal and a design that enables straightforward replacement. Installation tips Install directly onto the cleaning fluid reservoir; no tools required. After fitting, check that the gasket forms a tight seal to avoid leaks. Use scenarios Routine maintenance: a damaged or missing cap to restore proper sealing and prevent washer fluid loss. Onroad refills: during refilling, snap the cap back on to keep fluid secure and ready for use. Winter or long trips: ensure the reservoir remains sealed to avoid spills and keep washer fluid accessible in varying temperatures and driving conditions.