The Watts LF919-QT-FS is a 1/2 inch lead free reduced pressure zone backflow preventer assembly designed to prevent the flow of polluted water from entering the potable water supply due to backsiphonage and/or backpressure. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards and from other contaminants found at the service line entrance.

Key Features

• Includes a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve.
• Compatible with an add-on sensor connection kit to extend flood monitoring and relay alerts for potential flooding events.
• Designed for integration with a Sensor Control Monitor to deliver maintenance alerts to a Building Automation System (BAS) via RS-485 Modbus or the Nexa platform by Wi-Fi connectivity.
• Features lead-free bronze body construction with NPT end connections.
• Equipped with quarter turn ball valve shutoffs with tee handles for isolation.
• Contains two poppet style check valves and replaceable check seats for reliable performance.
• Compact, space-saving design with separate access covers for the check valves and relief valve.
• Top-mounted, screwdriver-slotted test cocks facilitate easy testing and use in reduced clearance installations.
• EZ twist relief valve cover with quarter turn locking joint captures the spring load during repair, simplifying disassembly.
• Bottom-mounted relief valve for reduced space requirements.