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Introduction to the F-451 Flow Meter


The F-451 Flow Meter is a variable area style flow meter designed to mount in-line vertically to water pipes, or panel mounted, as part of a water system. The F-451 Flow Meter has been an industry-standard in the water market for over 50 years. The accuracy, simple design, easy installation, and affordable pricing make the F-451 an excellent choice for your water flow measurement needs.  

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Product Overview / Features of the F-451 Flow Meter 

  • Installs quickly. 
  • Direct reading permanent scale. 
  • Adapter sizes 1” F/NPT Polysulfone, 1-1/2” F/NPT PVC, or 1” M/NPT 90 degree Elbow adapters.  
  • Vertical installation only. In-line or panel mount.  
  • Flow rates from .5 to 40 GPM, 2 to 155 lpm. 
  • One piece molded Polysulfone body. 
  • Not suitable for installation in direct sunlight.  
  • Easy to read dual scale for GPM and LPM.  
  • 316 SS Float and Guide Rod. 
  • Optional Polycarbonate Shield available. 
  • 1 Year Limited Warranty. 


The F-451 Flow Meter is perfect for water monitoring applications in processing plants, water systems, RO Systems, DI systems, wet processing equipment, cooling systems, and water plants.  The F-451 Flow Meter has excellent temperature, pressures, and chemical resistance.  The F-451 Flow Meter can be installed on any existing Schedule 40 or Schedule 80 pipe.  Typical solutions used with this flowmeter will be free of debris.  

All F-451 Flow Meters are tested with water.  F-451 Flow Meter may be used suitable for other chemicals. It is the responsibility of the user to ensure it is compatible with the chemical or application in question.  

Ordering Information and Product Matrix 

Flow meters must be ordered with a complete part number, specifying scale, adapter size, and O-ring material. A sample complete part number is F-451001LHN, indicating 1 -10 GPM with 1” FNPT adapter and Viton O-rings. 

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