JEGS Billet Filler Neck Expansion Tanks increase the efficiency of your cooling system by continually purging trapped air. Also ideal for use with closed or low mount radiator designs allowing you to fill from the highest point in the system. Features convenient, built-in sight gauge and reusable o-ring seal designs. Includes stainless hardware. Fits Chevy and Chrysler V8 intake manifolds. Vertical design measures 5-5/8" tall. .