Hayward CAT Rotary Flow Sensor | CAX-20203
Hayward Products
SKU: CAX-20203
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.
Related Products
- Hayward CAX-20203 (search)
- Hayward CAT Controller Parts (search)
- Hayward pH Probes (search)
- Hayward ORP Probes (search)
- Chemical Controller Flow Switches (search)
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: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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