Product Overview The Hayward pH Sensor with 24" Cable W3PRO15-2 is a genuine Hayward replacement pH probe designed for accurate pool and spa water chemistry monitoring. This sensor continuously measures pH levels and sends readings to compatible Hayward chemical control systems, helping maintain balanced water, improve swimmer comfort, and support consistent sanitizer performance. This model is commonly listed as W3PRO15-2 / PRO15-2 and includes a compact 24-inch cable for installations where the controller and flow cell are close together. Hayward identifies this product as a 2-foot cable pH probe designed for commercial pools. Ideal For Commercial pool chemical automationPool and spa pH monitoringHayward CAT controller systemsHayward HCC automated chemical controller systemsReplacement of worn or aging pH probesEquipment rooms with short sensor cable runsFacilities needing real-time pH monitoringService professionals maintaining automated chemical feed systems Key Features Genuine Hayward Replacement Sensor The W3PRO15-2 is a factory-original Hayward pH sensor designed for compatible Hayward chemical controller systems. 24" / 2 ft. Cable Included This model includes a 24-inch / 2-foot cable, making it ideal for compact installations where the probe is located near the controller or flow cell. pH Monitoring The sensor measures pool or spa pH levels and transmits readings to the controller for monitoring and chemical feed decisions. Compatible with CAT Controllers Listings identify this probe for Hayward CAT controller systems, including CAT1000, CAT3500, CAT4000, CAT5000, and CAT5500 models. Compatible with HCC Controllers Retail specifications also list this sensor for compatible Hayward HCC automated chemical controllers. Heavy-Duty Probe Construction This sensor is commonly described as a heavy-duty pH replacement probe for chemical controller applications. 1/2" NPT Probe Body Listings describe the probe body as an injection-molded 1/2" NPT body designed for chemical automation installations. Helps Maintain Balanced Water Accurate pH readings help the automation system support proper water balance, swimmer comfort, sanitizer performance, and equipment protection. Benefits The Hayward W3PRO15-2 is a practical replacement part for pool operators and service professionals who rely on automated chemical control. A properly functioning pH sensor helps the controller monitor water balance accurately, which can reduce guesswork and support more consistent chemical feed control. With its compact 24" cable, genuine Hayward fit, and compatibility with CAT / HCC-style chemical controllers, this pH probe is a dependable choice for maintaining automated pool and spa water chemistry systems. Specifications Specification Details Brand Hayward Model W3PRO15-2 Alternate Model PRO15-2 SKU W3PRO15-2 UPC / Barcode 610377389839 Product Type pH sensor probe Sensor Type pH Cable Length 24 in. / 2 ft. Application Pool and spa chemical automation Compatible Controllers Hayward CAT controllers; Hayward HCC automated chemical controllers Common CAT Compatibility CAT1000, CAT3500, CAT4000, CAT5000, CAT5500 Body Style 1/2" NPT-style probe body Construction Heavy-duty chemical-resistant probe body Package Quantity 1 sensor Installation Type Sensor probe installation into compatible flow cell / sensor manifold ORP Sensor No Temperature Sensor No Professional Installation Recommended Yes Calibration Required Yes Warranty Manufacturer warranty applies What’s Included Hayward W3PRO15-2 pH sensor probe24" / 2 ft. sensor cable Chemical controller is not included.Flow cell, sensor manifold, fittings, and calibration solutions are not included unless supplied separately by the seller.Professional installation and calibration by a qualified pool professional is recommended. Customer-Facing Q&A What does this sensor measure? This sensor measures pH in pool or spa water. How long is the cable? This model includes a 24-inch / 2-foot cable. Is this the same as PRO15-2? Yes. W3PRO15-2 is commonly listed as the open-line version of PRO15-2. Is this an ORP sensor? No. This is a pH sensor. ORP 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. Is this a genuine Hayward part? Yes. This is listed as a genuine Hayward replacement pH probe. Does this include the controller? No. This listing is for the pH sensor probe and cable only. Does this include calibration solution? No. Calibration solution is not included unless bundled separately by the seller. Does this sensor need calibration? Yes. pH sensors should be calibrated according to the controller and sensor instructions for accurate readings. What is the difference between W3PRO15-2 and W3PRO15-10? The main difference is cable length. W3PRO15-2 has a 24" / 2 ft. cable, while W3PRO15-10 has a 10 ft. cable. What is the UPC / barcode? The UPC / barcode is 610377389839.
