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Introduction to the F-400 Flow Meter


The F-400 Flow Meter is a variable area style flow meter designed to mount in-line vertically to water pipes. The F-400 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-400 an excellent choice for your water flow measurement needs.  

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Product Overview / Features of the F-400 Flow Meter 

  • Installs quickly. 
  • Direct reading permanent scale. 
  • Adapter sizes 1/4”, 3/8”, 1/2” F/NPT. Polypropylene adapters.  
  • Vertical installation only. 
  • Flow rates from .025 to 5 GPM , .10 – 20 lpm. 
  • Acceptable in outdoor locations in direct sunlight.   
  • One piece machined Acrylic body. 
  • Easy to read dual scale for GPM and LPM with white back reflector.  
  • 316 SS (Or PVDF, PTFE) Float and Guide Rod 
  • 1 Year Limited Warranty. 


The F-400 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-400 Flow Meter be installed on any existing Schedule 40 or Schedule 80 water pipe where water is relatively clean and free of debris.  

All F-400 Flow Meters are tested with water.  F-400 Flow Meter may be used suitable for other chemicals. It is the responsibility of the user to ensure it is compatible with 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-40050LN-6, indicating  .05 -.5 GPM with .375” FNPT polypropylene adapter and Viton O-rings. 

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