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GRI Piston Diaphragm Pumps

Please Contact us for Additional Information on Pump Options and Pricing 415-457-6880

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Piston diaphragm pumps are positive displacement pumps designed to economically transfer small volumes of fluid at low discharge pressures. The lightweight, compact pumps are self-priming, corrosion resistant and can handle viscous fluids. These features make the pumps ideal for high volume copy machines, scientific and laboratory instruments and other chemical dispensing applications.

Flow Rate: Range to 250 microliters per stroke.

Max. Discharge Pressure: Range to 2.6 psi (6′).

Self-Priming: To 3 feet.

Max. Fluid Viscosity: To 300 centistokes.

Max. Fluid Temperature: To 200°F (93°C).

Typical Duty Cycle: 1 cycle/second (1/2 sec. on – 1/2 sec. off). Higher frequency operation achievable with external driver.

Metering Accuracy: ±2% stroke-to-stroke (for a stationary setup).

I.D. Tubing Size: 3/16″.

Approximate Weight: .265 lb.



  • Economical
  • No dynamic seals
  • Continuous duty rated
  • Dry run capability
  • Self-priming
  • No backflow
  • Corrosion resistant