The Watts Series 957Z Reduced Pressure Zone (RPZ) backflow preventer, sized at 4 inches, is designed to protect potable water systems from contamination caused by backpressure or backsiphonage. This assembly is ideal for health hazard applications and features a Z-pattern orientation and a compact, lightweight design.

Flood Detection & Alerts

• Incorporates a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve.
• The sensor is installed on the assembly exterior and does not alter assembly functions or certifications.
• An add-on connection kit (sold separately) is required to activate the flood sensor's alert features.
• Connection kit options include integration with BMS, cellular communication, or the Sensor Control Monitor for BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Construction & Features

• Features a 304 (Schedule 40) stainless steel housing and sleeve.
• Includes UL and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
• Equipped with a bottom mounted cast stainless steel relief valve.
• Utilizes patented torsion spring check modules for lowest pressure loss and unmatched ease of serviceability.
• Groove couplings allow for integral pipeline adjustment and ease of installation.
• The wetted surface of this product contains less than 0.25% lead by weight, classifying it as Lead Free*.

Use of the flood sensor does not replace the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance of this product, including the need to provide proper drainage in the event of a discharge.

The information contained herein is not intended to replace the full product installation and safety information available or the experience of a trained product installer. You are required to thoroughly read all installation instructions and product safety information before beginning the installation of this product.