Fleck 3900

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  • Lead-free brass valve body for superior strength and durability
  • Continuous service flow rate of 250 GPM with a backwash of 100 GPM
  • Backwash capability accommodates softener tanks up to 63″ and filter up to 42″ in diameter
  • Fully adjustable 3- or 5-cycle control for efficient and reliable water treatment system
  • Designed for single or multiple tank systems
  • Environmental protective cover for water resistance, corrosion resistance, and UV stability
  • Time-tested, hydraulically-balanced piston for service and regeneration
  • Rugged-built electromechanical timer designed with heavy duty 3/8″
  • plastic gears


Fleck’s 3990 valve is ideal for commercial and industrial water softeners and filters with service flows up to 250 GPM and backwash requirements of up to 100 GPM. The Fleck 3900 valve body offers rugged construction and simple mechanical operation.

Fleck Control Valves automatically control the backwash and regeneration cycles for media filters and water softeners to keep your water treatment system working at optimal performance all the time. Fleck control valves are available in time-clock option which can be set to regenerate every day, every two to three days, or on certain days of the week. Fleck valves are also available in metered options for on-demand regeneration based on the volume of water that has been used. Manual operation, dP triggered regeneration, interlocking, series and remote start configurations are available upon request.

System Specifications:

  • Continuous (15 psi drop): 250 gpm
  • Peak (25 psi drop): 325 gpm
  • Max Backwash (25 psi drop): 100 gpm
  • Valve Material: Lead-Free Brass
  • 3” NPT In/Out Connections
  • 6” – 8 Threaded or Flanged
  • 1800 Brine System (softener)
  • Hard Water Bypass

Download Spec Sheet


Download User Manual



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