How to works:When the coolant in the radiator expands with heat and the pressure exceeds the design pressure threshold of the radiator cap, the coolant flows into the radiator overflow tank. The radiator overflow tank provides a place for the expanding coolant to settle, keeping the engine coolant at the proper operating temperature and the engine running at peak performance Durable & Non-Leaking: The coolant overflow tank is constructed of high-quality 7075 aluminum, fully tig-welded and equipped with an O-ring seal to provide a better air-tight environment. Prevents coolant leakage while extending service life Easy to clean: Magnetic drain plug on bottom for easy draining and cleaning Universal for most vehicles: Compatible with Honda,Toyota, Subaru,Mitsubishi, Mazda,Ford,Acura,Nissan,Infiniti,Lexus,Scion,Jeep,Dodge,GM and more. Please measure before purchase to make sure there is enough space to install the coolant overflow tank Easy to check: switchable inlet/outlet and level indicator can be placed on the right or left side of the Aluminum Radiator Overflow Tank; level indicator is easy to read (switchable level indicator). With side (L/R) transparent hose to monitor the amount of coolant in the overflow bottle at any time Universal Coolant Overflow Tank