3'' Pro Series Metallic Diaphragm Pump

237 GPM (897 LPM)

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Overview & Features


  • Industry leading flow rates with a maximum delivery of 237 GPM (897 LPM)
  • Ideal answer to big volume applications 
  • Efficiency - Motor design delivers optimum air efficiency
  • Reliability - ARO's patented 'Unbalanced' air valve ensures no-stall operation
  • Versatility - Appropriate for various applications such as  material transfer to portable dewatering
  • Environmentally Sound - Bolted construction for leak-free fluid handling
  • Serviceability - Easy access to ball checks and fluid caps for maintenance and repairs


  • 66312 Air Line Connection Kit: contains Piggyback Filter / Regulator, pipe nipple & 5’ section of hose
  • 66975 Cycle Counter Kit
  • 637434 Air Section Service Kit
  • 637433-XX Fluid Section Service Kit

Pump Casing Materials

  • Aluminum
  • Stainless Steel
  • Cast Iron

Diaphragm Materials

  • PTFE w/ Santoprene backer
  • Hytrel
  • Santoprene
  • Nitrile