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A3 (Legacy)

Introduction to the A3 (Legacy)


The FLEXFLO® A3 (Legacy) Peristaltic Metering Pump is a positive displacement chemical metering pump that delivers smooth, continuous chemical feed. It is especially effective when injecting chemicals that off-gas like Peracetic Acid and Sodium Hypochlorite.  The peristaltic technology is a near-continuous flow that delivers consistent precise flow without the need for check valves.  

Note: The A3 (Legacy) pump has a newer version. If you have questions about the new A3S FLEXFLO pump, click here.  

The A3 (Legacy) pump has two versions. The A3V pump has remote speed control via 4-20ma, 0-10 VDC, Frequency, and Pulse inputs. The A3F pump has only manual speed adjustment.  

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Product Overview / Features of the A3 (Legacy) Peristaltic Pump 

  • The A3 (Legacy) pump can deliver up to 33.3 GPH (126 LPH) at 100% motor speed.  
  • Up to 125 psi. (See specific tube ratings and tube life data before choosing a tube) 
  • Brushless DC Motor is capable of 2,500:1 turndown.   
  • 10-button LCD Display. 
  • Manual Speed Control. 
  • Remote Start/Stop. 
  • 4-20mA input and 4-20mA output. Fully scalable at the pump. (A3V model only) 
  • Pulse and Frequency input speed control. (A3V model only) 
  • Four Alarm Outputs. (programmable) (V model only, F model has only one output alarm) 
  • Integral TFD leak detection.  
  • Manual Cycle Adjust Mode. (A3V model only) 
  • Dispensing Mode. (A3V model only) 
  • FVS (Flow Verification System) input.  
  • Manual Prime. 
  • Wetted parts are PVDF connectors and, Flex-A-Prene, Flex-A-Chem, or Flex-A-Thane tubing. 
  • Removable terminal blocks and junction box for communication wiring. 
  • 2 Year Limited Warranty. 


The A3 (Legacy) pump is designed to provide smooth chemical feed for a variety of chemicals and processes.  It can reliably pump chemicals that off-gas such as sodium hypochlorite, peroxide, ammonia, and PAA (peracetic acid), as well as a variety of other chemicals.  

The A3 (Legacy) is effective with suction lifts, polymers, slurries, and solutions with minor debris that would normally cause issues with diaphragm pumps. 

Product Matrix  

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Use this matrix to reference your product number.  This matrix cannot be used to order new pumps. 

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