Overflow tank dome end with optional site glass

black over brass, 2" diameter with dome end.  Select the preferred site glass for coolant level viewing and add polish if you what it to shine.  Made in the USA

Here is how it works...should the system pressure exceed the cap’s rating, the spring will compress and fluid will flow through the upper tube to fill the chamber.  

In the event the recovery tank reaches capacity, the fluid will find the second tube and exit to the street.  A vacuum will draw the coolant back into the cooling system as the engine cools down.

Contact us directly for alternative sizes, finished or shapes.