grade coolant/overflow tank made from durable plastic with and low temperature resistance for reliable performance as an expansion and overflow reservoir. Easy installation using original hardware, compatible with the vehicle's radiator bottle and designed for a straightforward plugin replacement. Complete kit with reservoir ready for installation, no modification required. Radiator water tank helps keep your engine at the correct temperature under a variety of operating conditions. Use scenarios Replacement on vehicles with standard radiator expansion tanks, using the original hardware for a seamless swap. During radiator service or coolant system refresh, as the kit is complete with reservoir and requires no modification. Vehicles operating in demanding conditions such as extreme temperatures or heavy loads, where maintaining engine temperature is important.