Gatr automatic Portable Air Inflator -

Military designed and USA made inflator made for use with the Ground and Transmit Receiver (GATR) satellite ball (see last pic). Includes case.

Can have a variety of uses but for the us military, this was specifically to inflate and maintain pressure in the inflatable satellite antenna, with internal pressure in the range of 3 inches of water column. The small ports at either end are for the pressure tubes, and allow the internal pressure sensors to be used to adjust the blower speed so the internal pressures of the radome are maintained within the required range