Product Overview

The Hayward CAT ORP Sensor with 24" Cord W3PRO25-2 is a genuine Hayward replacement ORP probe designed for pool and spa chemical automation systems. ORP sensors measure oxidation-reduction potential, helping compatible chemical controllers monitor sanitizer activity and support consistent water quality control.

This model includes a 24-inch / 2-foot cable, making it ideal for compact installations where the controller and flow cell are close together. Hayward identifies the PRO25-2 as an ORP probe with a 2-foot cable for commercial pool applications, and current retailer listings identify the UPC as 610377389853.

Important Cable Length Note

Some listings may describe this item as having a 24' cord, but this model is the 24-inch / 2-foot cable version, not a 24-foot cable. Pool Supply Unlimited also notes this correction on its product page.

Ideal For

Commercial pool chemical automation
Pool and spa sanitizer monitoring
Hayward CAT controller systems
Hayward HCC automated chemical controller systems
Replacement of worn or aging ORP probes
Compact equipment rooms with short cable runs
Service professionals maintaining automated chemical feed systems

Key Features

Genuine Hayward ORP Replacement Probe

The W3PRO25-2 is a factory-original Hayward ORP sensor designed for compatible Hayward chemical controller systems.

24" / 2 ft. Cable

This model includes a 24-inch / 2-foot cable, suitable for installations where the sensor flow cell is located close to the controller.

ORP Monitoring

The sensor measures oxidation-reduction potential, helping compatible controllers monitor sanitizer activity and make chemical feed decisions.

Compatible with CAT Controllers

This probe is commonly listed for Hayward CAT controller systems, including commercial CAT water chemistry controller applications.

Compatible with HCC Controllers

Retail and distributor listings describe the PRO25-2 as compatible with Hayward CAT and HCC automated chemical controllers.

Heavy-Duty Probe Construction

The Professional Series ORP probe is commonly described as a heavy-duty replacement sensor for chemical controller applications.

Durable NPT Probe Body

Listings describe the probe as having a durable injection-molded NPT body designed for chemical resistance.

Helps Support Sanitizer Control

A properly functioning ORP sensor helps the automation system maintain more consistent sanitizer control by providing continuous water quality feedback.

Benefits

The Hayward W3PRO25-2 is a practical replacement part for commercial pool operators and service professionals using automated chemical control. Accurate ORP readings help the controller monitor sanitizer effectiveness, reduce manual guesswork, and support consistent pool water quality.

With its compact 24" cable, genuine Hayward fit, and compatibility with CAT / HCC-style chemical controllers, this ORP probe is a dependable choice for maintaining automated pool and spa chemical systems.

Specifications

What’s Included

Hayward W3PRO25-2 ORP sensor probe
24" / 2 ft. sensor cable

Chemical controller is not included.
Flow cell, sensor manifold, fittings, and ORP verification solution are not included unless supplied separately by the seller.
Professional installation and setup by a qualified pool professional is recommended.

Customer-Facing Q&A

What does this sensor measure?

This sensor measures ORP, which stands for oxidation-reduction potential. ORP is commonly used by chemical controllers to monitor sanitizer effectiveness.

How long is the cable?

This model includes a 24-inch / 2-foot cable.

Is this a 24-foot cord?

No. This model is the 24-inch / 2-foot cable version, even though some listings may display “24' cord.”

Is this the same as PRO25-2?

Yes. W3PRO25-2 is commonly listed as the open-line version of PRO25-2.

Is this a pH sensor?

No. This is an ORP sensor. pH sensors are separate parts.

What systems is this compatible with?

This sensor is commonly listed for Hayward CAT controllers and Hayward HCC automated chemical controllers.

Does this include the controller?

No. This listing is for the ORP sensor probe and cable only.

Does this include calibration or verification solution?

No. ORP verification solution is not included unless bundled separately by the seller.

What is the difference between W3PRO25-2 and W3PRO25-10?

The main difference is cable length. W3PRO25-2 has a 24" / 2 ft. cable, while W3PRO25-10 has a 10 ft. cable.

What is the UPC / barcode?

The UPC / barcode is 610377389853.