Watts f391010 Rpz Backflow Preventer 1-1/4 in

Product Description

The WATTS f391010 is a reduced-pressure zone (RPZ) backflow preventer designed to protect potable water supplies from contamination through backpressure or backsiphonage. Sold under the LF909M1-QT model designation, this assembly is built for plumbing systems where a high-hazard cross-connection risk is present. At 1-1/4 inches in size and weighing 37.10 pounds, this is a substantial, full-assembly unit intended for licensed plumbers and mechanical contractors working on commercial or industrial water service installations.

This RPZ assembly is suited for installation on water supply lines serving irrigation systems, boilers, fire suppression systems, and other applications requiring testable, high-hazard backflow protection. The LF909M1-QT designation indicates a lead-free construction, making it appropriate for potable water service in jurisdictions enforcing lead-free plumbing requirements. Installation is typically performed during new construction or as a code-required retrofit on existing commercial water service connections.

Key Features

• Reduced-pressure zone design provides two independent check valves with a differential relief valve for high-hazard backflow protection
• 1-1/4 inch connection size suits medium-flow commercial and light industrial water service lines
• Lead-free (LF) construction meets NSF and applicable state and local potable water regulations
• QT configuration indicates a quarter-turn shutoff valve design for faster service isolation
• Full testable assembly supports annual inspection and testing as required by most local codes

Compatibility

Designed as an OEM-style replacement or new-installation RPZ backflow preventer for 1-1/4 inch potable water supply lines requiring lead-free, testable reduced-pressure zone protection.

Installation Notes

Installation must be performed by a licensed plumber or backflow assembly tester in accordance with local plumbing codes and ASSE 1013 standards. Shut off the main water supply and relieve line pressure before beginning installation. The assembly must be installed in the correct flow direction as marked on the body, and adequate clearance must be maintained below the relief valve discharge port per local code requirements. After installation, the assembly requires initial testing and periodic annual testing by a certified backflow tester.

Technical Specifications

• Size: 1-1/4 inches
• Weight: 37.10 pounds
• Model Designation: LF909M1-QT
• Assembly Type: Reduced Pressure Zone (RPZ)
• Lead-Free: Yes

Standard Information

• Brand: WATTS
• Manufacturer Part Number: f391010