2470-9016 Tank Reserve refers to the coolant auxiliary tank (also called expansion tank) of Doosan excavators, compatible with multiple Doosan Daewoo excavator models such as the SOLAR 130LC-V, SOLAR 140LC-V, and SOLAR 150LC-V. It is connected to the main radiator of the excavator's cooling system, and its core purpose is to ensure the stable operation of the cooling system. As a storage and buffer component for the coolant, it reduces the frequency of coolant contact with air, slows down the rate of coolant oxidation and deterioration, and also reduces the formation of scale and impurities inside the cooling system. This reduces the probability of radiator and pipe blockage or corrosion, extends the service life of the entire cooling system, and reduces excavator downtime due to cooling system failures.