This is also a custom built Ron Davis double pass radiator. I have set it up so it can be easily installed and removed. The object is to catch normal free air when you are going to be making an extended freeway trip of long distance. Water flows out of the engine, through this radiator and then to the rear and completely through the rear radiator before returning to the engine. The radiator basically fits where the original radiator was. I had an original style air dam back to the inside of the hood, such when the hood is closed, it blocks air from flowing around the front radiator as Willys original designed. It means all air coming in is forced through the radiator.