Applicable models: this radiator coolant overflow tank is compatible for Ford F600 F700 F800 1980-1999. Compatible for Ford F600 F700 F800 1980-1999. Function: when the coolant pressure in the radiator exceeds the set value of the pressure cap, the coolant is sealed by the pressure cap and flows into the radiator coolant overflow tank through the overflow pipe, prolong engine life and enhance engine performance.