Universal 1L Radiator Coolant Overflow Tank Expansion Catch Tank Can Aluminum JDM Container, BlackDESCRIPTION HOW TO WORK When the coolant pressure in the radiator exceeds the pressure cap setting, the coolant is sealed through the pressure cap and flows through the overflow tube into the radiator coolant overflow tank. 7075 ALUMINUM&TIG WELDED Expansion tank made of 7075 aluminum for enhanced strength, anodized polished and durable, better than plastic material. EASY TO CHECK Switchable inlet outlet and level indicator can be placed either on the