The Chase Bays Aluminum Coolant Overflow holds a unique set of innovative features. A common side effect of spirited driving is most coolant overflows quickly fill up and spew coolant out of the cap under heavy use, leaving you with an engine bay to clean. The bottom of the overflow has ¼ hose barb inlet and outlet fittings. Inside the overflow the outlet tube extends up 1" from the fill cap. This expels any fluid through the outlet fitting and to your desired location.