13in Smooth Overflow Tank

The 13in Smooth Overflow Tank from Billet Specialties is an essential cooling system component for serious automotive enthusiasts and custom builders. This overflow tank serves as the pressure relief and recovery vessel for your engine's coolant system, capturing excess coolant as it expands under operating temperature and returning it to the radiator as the engine cools. Whether you're building a high-performance street machine, a show vehicle, or restoring a classic with modern cooling upgrades, a quality overflow tank prevents coolant loss and maintains proper system pressure.

Billet Specialties engineered this 13-inch tank with a smooth, seamless exterior finish that complements any custom cooling system aesthetic. The compact yet functional design accommodates standard hose connections, while the billet aluminum construction resists corrosion and thermal stress that plagues conventional plastic reservoirs. At just 2.39 lbs, it adds minimal weight while providing superior durability compared to factory plastic tanks that degrade under sustained heat cycles and UV exposure.

This overflow tank works with most aftermarket cooling system configurations, including custom radiator builds, electric fan conversions, and engine swaps where factory overflow components don't fit the revised layout. Its design is particularly beneficial for those running higher coolant temperatures or extended track sessions, ensuring optimal performance and reliability.