ARO 2:1 Ratio High Pressure Pump


The 2:1 ratio is accomplished by using the effective surface area of both diaphragms to double the output pressure.

Product Description

The ARO 2:1 Ratio High Pressure Pump is a high-performance air-operated diaphragm pump that is designed for demanding applications. It can produce up to 200 psi of pressure, which makes it ideal for a variety of tasks, such as:

  • Cleaning and dewatering equipment
  • Transferring fluids
  • Rinsing and flushing
  • Applying pressure to fluids


  • A 2:1 ratio diaphragm design that produces twice the output pressure of a standard diaphragm pump
  • A bolted construction that eliminates leaks and reduces maintenance costs
  • A Simul-Shift™ valve technology that prevents stalling and freezing
  • A Quick Dump™ valve that allows for quick and easy discharge of fluids
  • A modular design that makes it easy to repair and maintain
  • Available in 3″, 2″ and 1.5″ port sizes


  • 66109 Air Line Connection Kit: contains Piggyback Filter / Regulator, pipe nipple & 5’ section of hose
  • 94117 Muffler
Pump Casing Materials
  • Stainless Steel
Diaphragm Materials
  • Santoprene
  • Hytrel
  • PTFE/Santoprene