Watts 0391011 Valve

Standardize your high-hazard cross-connection protection with the Watts 0391011 (Model 1.5" LF909M1-QT). This Reduced Pressure Zone (RPZ) backflow preventer is the official lead-free replacement for the legacy 0385718 series, engineered for containment at the service line entrance or for residential and commercial health-hazard applications. Built with a lead-free silicon bronze body, this assembly utilizes the patented air-in/water-out principle to ensure superior relief valve discharge performance during simultaneous backsiphonage and backpressure events.

The Watts 0391011 features a modular design for streamlined field maintenance, including replaceable check seats and a single access cover. Rated for 175 psi and operating temperatures up to 140°F, it includes quarter-turn full-port ball valves with lever handles and top-mounted test cocks for easy diagnostic access. This assembly is ASSE 1013 and AWWA C-511 compliant, supporting both horizontal and vertical orientations (vertical-up only for the 1.5" size) to meet specific mechanical room footprints and local plumbing codes.

• System Compatibility: Direct drop-in lead-free replacement for the discontinued 0385718, utilizing the same 1.5" NPT connection footprint.
• Tool-Free Access: Compact modular design allows for in-line repairs of check modules and relief valve stems without specialized tools.
• High-Capacity Relief: Patented pressure differential relief valve prevents the entry of contaminants into the potable water supply.
• Durable Construction: Silicon bronze body resists corrosion, ensuring long-term seat integrity in continuous pressure piping systems.

Is the 0391011 a direct replacement for the 0385718?
Yes, the 0391011 is the updated, lead-free version of the 0385718. It maintains the same 1.5-inch NPT threaded layout, ensuring compatibility with existing piping configurations where high-hazard protection is required.

Can this RPZ be installed in a vertical orientation?
The LF909M1-QT is approved for horizontal and vertical-up installations. Always check local water authority requirements, as drainage and air gap clearance for the relief valve must be maintained to prevent submersion.

What is the maximum pressure and temperature rating?
This 1.5" backflow preventer is rated for a maximum working pressure of 175 psi (12.1 bar) and a continuous operating temperature of 140°F (60°C).

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.