Vacuum Wheels (also known as rotary air locks) are used in various places throughout the ginning process to drop cotton into a conveying air stream. They resemble a revolving door lying on its side and are useful for allowing material to move from one area to another without letting air escape in the process. Cherokee makes heavy-duty Vacuum Wheels with easily replaceable flashing (rubber seals). The Cherokee design includes easy access for repair and the housing design is gentle for superior flashing life. See Cherokee Vacuum Dirt Feeders and Vacuum Seed Feeders for another example of this type of machine.