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Flow Restrictor 550 ML for 50 GPD Reverse Osmosis Water System

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Flow Restrictors (also known as Flow Controls or Capillaries) are required for all reverse osmosis systems. The Flow Restrictor must be properly sized to the RO membrane capacity. Flow Restrictors create pressure throughout the reverse osmosis membrane element and maintain a desired ratio of reject flow (to drain) and permeate (product) flow.


  • Quick connect fittings

  • Simply push your 1/4" poly tube firmly into the quick connect fittings located on both the inlet and outlet ends of the flow restrictor and you are done.

Guideline for selecting an inline flow restrictor

RO Membrane Size
(Gallons Per Day)
 Use Flow Restrictor
(ML Per Minute)
   24 GPD

  300 ML

  36 GPD
  420 ML
  50 GPD
  550 ML
  75-100 GPD   800 ML
Kindly Reminder
replace the Flow Restrictor each time you replace your reverse osmosis membrane (Recommended as a precaution)
Installation Diagram for your reference
What's in the box
  • 1 piece of Flow Restrictor 550 ML
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