When the coolant in the radiator expands during heating, the pressure in the radiator rises. When the pressure exceeds the design pressure of the radiator cover, the coolant will flow into the radiator overflow tank through the overflow port.
Universal 2L Aluminum Radiator Coolant Overflow Bottle Recovery Water Tank + Cap
Universal 2L Aluminum Radiator Coolant Overflow Expansion Tank Reservoir Kit
Universal 2L Aluminum Coolant Radiator Overflow Reservoir Expansion Tank Silver
Universal 1.2L Aluminum Radiator Expansion Coolant Overflow Tank Bottle With Cap
Universal 2L Aluminum Slive Coolant Radiator Overflow Recovery Water Tank Bottle
2L Aluminum Radiator Coolant Overflow Bottle Recovery Water Tank Universal
