The cup pump is one of the best additions you can make to your RC powder coating system. By adding the cup pump to your existing oem cup, you gain complete control over your cloud by independently controlling the powder dosage and air pressure behind the powder cloud. So whether you need a heavy cloud with low air pressure, a light cloud with high air pressure, or something in between, this is the modifcation you need. This is a simalar set up to using a fluidizing hopper with a pump, just mounted directly on the gun. To use this cup pump, you will need either the cup mounted regulator or more air line if you already have the fluidizing hopper kit.