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H2flow FV-4 4" FlowVis Flowmeter Check Valve FV4

Original price $599.99 - Original price $599.99
Original price
$599.99 - $599.99
Current price $599.99

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A revolution in flow measurement

Ingenious in concept and flawless in operation, FlowVis® flow meters have been revolutionizing the way flow is measured in pool and spa applications since their inception in 2012.

With unrivaled accuracy, greater installation flexibility, and more NSF 50 certified models than any other brand, it’s easy to see why FlowVis® is the flow meter of choice for pool and spa professionals everywhere.

  • Installation flexibility; installs horizontally, vertically, or even upside-down
  • Can be installed with little-to-zero straight pipe requirements with no effect on accuracy
  • ≥98.1% accuracy across the entire model range
  • Models available for 1.5” - 8” and metric units for DN80 - DN200
  • More NSF 50 certified models than any other brand of flow meter
  • Doubles as a check valve (1.5”, 2”, and 2.5” models)
  • Digital upgrade (model FV-D) available for all FlowVis models
  • The first and only flow meter for pools and spas to be certified for outdoor use
  • Clear, easy-to-read scale in GPM or optional LPM or m3/h
  • Installs quickly and easily with no calibration required
  • Manufactured in the USA
  • 15-year design life, 3-year warranty


  • Brand: h2flow
  • Application: Pool, Spa
  • Commercial, Residential, or Professional: Commercial
  • Weight: 5.55 pounds
  • Material: CPVC
  • Pressure Rating: 50 pounds per square inch
  • UPC Code: 641022703052
  • Part No.: FV-4, FV4

Support Documents:

  • FlowVis, FlowVis Digital Product Brochure (Imperial): English
  • FlowVis, FlowVis Digital Product Brochure (Metric): English
  • FlowVis Instruction Manual (Imperial): English
  • FlowVis Head Loss Data (Imperial): English
  • FlowVis Digital Instruction Manual (Imperial): English
  • FlowVis Digital Instruction Manual (Metric): English
  • FlowVis Service Repair Kit Instructions: English

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Disclaimer: Professional installation is required (not included). Proof of installation by a technician may be required to validate the factory warranty.

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Please Note: Images are for representation.