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The radiator expansion reservoir or overflow tank is now common in most modern vehicles where it collects the expanding coolant that is hearted by the engine and recycles it back into the coolant system, once it loses sufficient heat. This overflow tank works in conjunction with the radiator cap to protect the engin and prevent coolant loss due to overflow.
BOHANG is determined to continue its reliable high quality level and top class products.
Cool your engine with our expansion tank.