Easy installation: this radiator expansion tank uses the original hardware and plugs into the vehicle as the radiator expansion tank / water tank. Direct replacement for factory part: simply remove the original radiator expansion tank and install this coolant tank / overflow reservoir. Radiator bottle design: professional and practical construction with a clean appearance; compact and easy to handle and use. Durable construction: made from long-lasting material for reliable performance and extended service life. Compatibility and fit: designed as a direct replacement for factory components; suitable for vehicles that use standard radiator expansion tanks / overflow reservoirs. Use scenarios: - Replacing a cracked or leaking factory expansion tank during routine coolant system maintenance. - Restoring proper coolant overflow function by swapping in a new, reliable expansion tank during a system service. - DIY radiator maintenance on vehiclesWith standard expansion tanks, offering a straightforward swap without special tools.