Abstract: An apparatus is disclosed for pneumatically conveying dry particulate material from a source to a destination by cyclically loading and unloading a transfer vessel. The loading stage is accomplishing by creating a vacuum pressure within the transfer vessel to pull material into it, and after it is filled to its optimum capacity, switch a number of valves to convert the apparatus to the unloading stage wherein positive pressure is applied to the interior of the vessel to push the material down the output conveying line to its destination. The motive force in the operation of both stages is positive air pressure. The vacuum is generating by a high velocity venturi structure in combination with valving and piping which uses the positive air pressure. The unloading stage of operation utilizes the dense phase conveying, which is high pressure, low volume conveying.