From ThomasNet: New KNF Type NPK04 micro-miniature swing-piston pumps introduce high-performance and compact solutions to transfer, evacuate, or compress air. These extremely small (2.5 in. long) pumps deliver free flow rates up to 4 LPM and versions can be optimized to generate significantly increased vacuum (up to 21 in. Hg) or pressure (maximum 45 psig).
Typical OEM applications include medical and analytical instruments, ink-jet printers, and devices or equipment requiring reliable pneumatics, among others.
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KNF Micro-Miniature Swing-Piston Vacuum Pumps Generate High Flows at Vacuum or Pressure