Durable construction: made from robust plastic designed to withstand extreme temperatures without cracking or warping, so the cap holds up in hot summers and cold winters. Secure, leak‑proof fit: engineered to form a tight seal that prevents leaks, stops contamination, and helps maintain proper washer fluid flow to the system. Easy, tool‑ installation: simple twist‑on design allows fast, hassle‑ replacement — install or remove in seconds. Direct replacement part: this product is a replacement windshield washer fluid bottle reservoir tank cap that restores proper sealing and function to the reservoir. Key benefits Prevents spills and loss of washer fluid, saving time and money on refills and repairs. Protects the washer fluid from dirt and debris, helping ensure clearer windshields and reliable washer performance. Quick DIY fix that avoids a longer visit or more expensive repairs. Practical applications a lost or damaged cap after maintenance or an accident to stop leaks and contamination. Install before winter to prevent fluid loss and keep the washer system working in freezing conditions. Use during routine vehicle upkeep to restore a proper seal and maintain washer system reliability. Material and performance summary Material: durable plastic built for temperature resilience. Function: seals the washer fluid reservoir to prevent leaks and ensure proper fluid flow. Installation: twist‑on for fast replacement without tools.