Radiator Coolant Overflow Tank Long lasting protection: constructed from grade aluminum to prevent leakage and provide secure, durable protection for your cooling system. Easy to use overflow management: coolant is sealed by the pressure cap; when radiator pressure rises above the cap setting, excess coolant flows through the overflow tube into the radiator coolant overflow tank, helping maintain proper pressure and minimize losses. Efficient and reliable design: features two sturdy aluminum connection holes with a 36 mm inner diameter and 3 mm wall thickness, delivering solid flow and robust performance without compromising the cooling system. Broad range of use: a must have for race enthusiasts, delivering secure cooling for a wide range of applications. Practical use scenarios: 1) Track day or race car builds requiring dependable overflow management under heat. 2) Performance street cars seeking improved cooling reliability during spirited driving. 3) Vehicle cooling system upgrades or maintenance to prevent leaks and maintain proper pressure during service.