PEX Series Air Driven Liquid Pump

The PEX series of liquid pumps are unique in the ProTech range as they use pistons rather than plungers in the liquid ends. This enables them to achieve high pressure fluid outlet flows in both directions of the reciprocating pump action, making them double acting and very efficient. All PEX Series pumps are suitable for liquids, gases and vapours. They are also capable of drawing a vacuum down to 11.25 psi(absolute) in the 2-stage configuration.

Typical Applications

  • Transfer, at pressure, of water, LPG, SF6, Freons and other refrigerant fluids.
  • CO2 Fire Extinguisher filling.
  • Hydro-static Pressure testing.
  • Critical Extraction.
  • The transfer and/or extraction of LPG, LNG Freon and Refrigeration Fluids.
  • Dust suppression.


  • Stainless steel wet end materials of construction
  • Specialised construction materials available
  • PTFE pressure seals as standard
  • UHMWPE, Polyurethane & other special seals available
  • Separation & drainage between hydraulic & pneumatic seals
  • No airline lubrication required
  • 80mm stroke reduces cycle rate & increases life
  • Suitable for most hazardous areas
  • Available as a complete packaged system (ProPak)


Model No.Nominal RatioDisplacement per StrokeMax Outlet PressureConnection Size Inlet/OutletPriceAvailability
PEX4-464:147.55 cu in / 779 cc466 psi / 33.2 BARG0.375" NPT / 0.375" NPT$1,978.00 ex taxStocked item
PEX6-256.4:128.9 cu in / 473 cc707 psi / 49.8 BARG0.375" NPT / 0.375" NPT$2,139.00 ex taxStocked item