Hayward CAT Rotary Flow Sensor | CAX-20203

Hayward Products SKU: HPPCAX20203
Hayward CAT Rotary Flow Sensor | CAX - 20203 - Miscellaneous - img - 1

Hayward CAT Rotary Flow Sensor | CAX-20203

Hayward Products SKU: HPPCAX20203
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Hayward CAX-20203 Rotary Flow Sensor (Open Line) — CAT Controllers Flow Monitoring Sensor

The Hayward CAX-20203 is an OEM rotary flow sensor used with Hayward commercial CAT controller systems to confirm adequate recirculating water flow. It helps protect equipment and bathers by allowing the controller to disable chemical feed when flow is insufficient (for example during backwash, a clogged strainer, or other low-flow conditions).

Fits / Compatibility

  • Hayward CAT automated chemical controller systems (commercial automation applications)
  • Commonly referenced for select CAT 1000 and CAT 2000 controller setups (verify by controller model/parts diagram)
  • Pool Type: Commercial

What It Does

  • Monitors circulation flow conditions so the controller can verify safe, stable flow before chemical dosing
  • Helps prevent dosing during low-flow/no-flow events
  • Supports more reliable pH/sanitizer control by ensuring the controller only feeds when conditions are appropriate

Common Reasons to Replace

  • Flow-related alarms or faults traced to a failed sensor (after confirming proper flow and clean plumbing)
  • Intermittent or unstable flow indication
  • Physical damage, corrosion, or cable/connector issues
  • Preventive replacement during controller system service

Specs (Quick Reference)

  • Part Number (SKU): CAX-20203
  • Part Type: Automation / Commercial Parts
  • Channel: Open Line
  • GTIN: 761418012749
  • Approx. Shipping Weight: 0.2 lb
  • Warranty: 1-Year (Parts Only)

Installation Notes

  • Shut off power to the controller and ensure the circulation system is off before servicing.
  • Install in the correct orientation/location specified by your CAT controller plumbing diagram.
  • After installation, verify flow status changes correctly during normal operation and when flow is interrupted.
  • If issues persist, inspect for debris/restriction at the sensor location and confirm controller input wiring is correct.

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Maintenance Tips

  • Keep filters clean and baskets clear—restricted flow can cause nuisance flow alarms and interrupted chemical feed.
  • Inspect the sensor area periodically for debris buildup that can affect flow detection.
  • If the controller reports low flow unexpectedly, confirm pump operation and valve positions before replacing parts.
  • Keep controller enclosures dry and protected from moisture to reduce corrosion at sensor connections.
Questions about returns? View our return policy.

Hours Of Operation: 

Monday - Friday: 8:00 am to 4:00 pm Phoenix Time

Saturday and Sunday: Closed

  • Orders costing more than  $300 WILL be required to have signature confirmation upon delivery.
  • Handling time is typically only 1 day.   
  • Any item ordered after 1pm Phoenix time, may not ship same-day.
  • Call us if you require expedited shipping and we can give you quotes based on your needs.

Return Policy:

  • All products, except as noted below, are eligible for return up to 30 days after receipt of item.
  • For returns, an RMA form must be filled out HERE or customers can call for additional help.
  • Shipping costs will be deducted from all returned items.
  • Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in. 
  • Items broken, damaged, or inoperable due to installer error will not be refunded.
  • Fill out the return form or give us a call to obtain an RMA and return shipping label.
  • There are no returns on the Pentair Colorsync 618031
  • No returns on pool cleaners.
  • No returns on opened seals and o-rings.
  • No returns on capacitors.
  • If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
  • All products denied upon arrival at customers house WILL be charged the cost to ship.
  • Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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