The Cool Pak Pro solves the single biggest problems customers have complained about for years. The original Cool Pak is inefficient due to the filter/separator being located at the top of the aftercooler. As the aftercooler cools the compressed air, moisture drops out. The problem is that with the separator located on the high side, the moisture cannot be removed from the aftercooler. The Cool Pak Pro solves that problem by being the only aftercooler system designed to be laid down on it's back. In this orientation, the new swivel filter/ separator is moved to the low point in the system which allows it to actually function as intended.