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M4 (Legacy)

Introduction to the M4 (Legacy)


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The M4 (Legacy) FLEXFLO 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 M4 (Legacy) pump has a newer version. If you have questions about the new M4S FLEXFLO pump, click here.  

Product Overview / Features of the M4 (Legacy) Peristaltic Pump 

  • The M4 (Legacy) pump can deliver up to 158.5 GPH (600 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 10,000:1 turndown.   
  • NSF 61 Listed. 
  • 10-button LCD Display. 
  • Manual Speed Control. 
  • Remote Start/Stop. 
  • 4-20mA input and 4-20mA output. Fully scalable at the pump.  
  • Pulse and Frequency input speed control. 
  • Four Alarm Outputs. (programmable)  
  • Integral TFD leak detection.  
  • Manual Cycle Adjust Mode.  
  • Dispensing Mode. 
  • 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. 
  • 5 Year Limited Warranty. 


The M4 (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 M4 (Legacy) is effective with suction lifts, polymers, slurries, and solutions with minor debris that would normally cause issues with diaphragm pumps. 

Product Matrix  

Use this matrix to reference your product number.   

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