R series vibrator design is simple, but still gives a strong centrifugal force. The shell is made of extruded aluminum, and the fine steel rolls in it. This steel roll is positioned by two high impact resistant plastic caps. There are two horizontal holes and two vertical holes on the housing for easy installation. The air enters from one of the two inlet holes that are perpendicular to each other. The two air inlets are standard threads, and a stopper is provided for the purpose of blocking an empty inlet.