Product name and part number Radiator / Coolant Overflow Reservoir Cap for NV200 — Part No. 2171279900 Also described as Coolant Bottle Cap, Engine Radiator Tank Cover, and Fuel Tank Cap Key benefits — why you need this cap Restores a tight, reliable seal to the coolant or fuel system to prevent leaks and fluid loss. Keeps out dust and moisture that can contaminate coolant or fuel, protecting pumps, hoses, and sensors. Durable construction stands up to heat, pressure and everyday wear, reducing the need for frequent replacements. Simple hand operation for quick, tool removal and installation. What this cap does Seals the coolant overflow reservoir / radiator tank to maintain correct system pressure and prevent coolant loss. Functions similarly as a fuel filler or oil filler cap replacement where listed, providing a secure seal that supports proper system performance. Helps maintain engine cooling and fuelsystem efficiency by stopping unwanted air ingress and fluid escape. Features and important attributes Compatibility: Designed for NV200 (part no. 2171279900) and compatible with a wide range of vehicles including SUVs, trucks, and cars where this cap style is used. Material: Made from strength plastic for resistance to heat, pressure and everyday wear. Performance: Reinforced construction keeps the cap sealing reliably under harsh driving conditions and temperature changes. Userfriendly: Opens and closes easily by hand for fast access during refuelling or coolant checks. Operation and maintenance Handtighten after installation; ensure the cap seats evenly to form a complete seal. Regularly clean the sealing surface and threads to prevent debris from compromising the seal. Inspect periodically for cracks, deformation or worn sealing surfaces and if damage is found. Typical use scenarios a worn or cracked coolant overflow reservoir cap on a Nissan NV200 to stop coolant loss and restore proper cooling system pressure. Swap a damaged fuel filler or oil filler cap on an SUV or truck to prevent fuel evaporation, contamination and checkengine light triggers related to a loose or faulty cap. Fit as a preventative maintenance part for vehicles that see heavy city or highway use where caps are exposed to repeated thermal cycling and vibration. Notes Matches original function and part number 2171279900; confirm fitment for your specific vehicle model before . Designed as a direct, durable replacement to maintain system integrity without tools.