Watts 0391008 Valve

Engineered for high-hazard cross-connections, the Watts 0391008 (Model LF909QT-3/4) is a lead-free reduced pressure zone assembly designed for maximum protection of potable water supplies. This 3/4-inch backflow preventer utilizes a bronze body construction and the patented air-in/water-out principle to ensure high-capacity relief valve discharge during emergency conditions, specifically protecting against both backsiphonage and backpressure. For technicians managing service line entrances or continuous pressure piping applications, this unit offers a modular design that allows for in-line maintenance without specialized tools. The assembly features quarter turn ball valve shutoffs with tee handles, replaceable check modules, and top-mounted test cocks for simplified testing. This RPZ backflow preventer is a direct replacement for 0387121 and the 909QT-3/4 series, maintaining compliance with national plumbing codes and health hazard protection standards. With a maximum working pressure of 175 psi and a temperature range up to 140°F, it remains the industry standard for reliable backflow prevention in commercial and industrial HVACR environments.

Key Benefits:

• Internal Protection: Patented air-in and water-out design provides superior relief valve performance under dual failure conditions.
• Installation Versatility: Can be mounted in both horizontal and vertical upward flow configurations to fit tight mechanical room footprints.
• Lead-Free Reliability: Constructed with lead-free bronze to comply with safe drinking water regulations while maintaining durability.
• Simplified Maintenance: Features a single access cover and replaceable seats, enabling fast field repairs and reduced downtime.

Common Questions:

How do I know if the 0391008 is compatible with my existing 909QT setup?
The Watts 0391008 is the modern lead-free equivalent and direct functional replacement for the discontinued 0387121 and standard 0387110 models. It maintains the same 3/4-inch NPT connection points and center-to-center dimensions for drop-in replacement.

Does this unit include the air gap fitting for the relief valve?
No, this assembly includes the quarter turn valve shutoffs and test cocks, but the 909AGC air gap fitting must be ordered separately if required for your drainage installation.

What is the maximum pressure rating for this RPZ assembly?
The unit is rated for a maximum pressure of 175 psi. It is specifically designed for health hazard protection at the service entrance or for containment in continuous pressure systems.

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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.