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Watts 3/4 LF909-QT-S-FS Small Series 3/4 in. Reduced Pressure Zone Assembly Backflow Preventer

Mfr. Model #:
3/4 LF909-QT-S-FS (F122774)
KR Part #:
18.00 lbs
Usually Ships in 2 Weeks
Now Only!
Diameter of inlet and outlet is 3/4 inch. Prevents polluted water from entering a potable water supply. Complies with water authority requirements. 

Technical Specifications

Inlet Port: 3/4 inch
Outlet Port: 3/4 inch
Max Temperature: 140 degrees F
Max PSI: 175
Min Temperature: 33 degrees F

Product Description

3/4" Backflow Prevention Valve

Inlet and outlet both measure 3/4 inch in diameter. Constructed with lead free materials. Features an exclusive design integrating a patented air-in and water-out principle. Prevents polluted water from entering a potable water supply due to back siphonage. Ideal for use in continuous pressure piping applications, cross-connections identified as health hazards, and service line entrances. Manufactured to comply with national plumbing codes and water authority requirements.


  • Backflow Preventer Type: Reduced Pressure Zone Assembly 
  • Body Finish: Cast Bronze 
  • Body Material: Lead Free Bronze 
  • Body Pattern: Inline 
  • Brand Name: Watts 
  • Buy American Act Compliant: YES 
  • Bypass: No 
  • Cap And Tether: No 
  • Disc Material: Silicone 
  • EAN: 098268646665 
  • Elbow Fitting: No 
  • Hazard Protection Level: Health Hazard 
  • Hot And Harsh Water: No 
  • Hydrant Connection: No 
  • Inlet Connection Size: 3/4 IN 
  • Inlet Connection Size-Metric: 20 MM 
  • Inlet Connection Type: Female Threaded 
  • Inlet Shutoff Valve Type: Quarter Turn Ball Valve 
  • Inlet Thread Type: NPT 
  • Lead Free: YES 
  • Maximum Temperature-Fahrenheit: 140 
  • Maximum Working Pressure-BAR: 12.10 
  • Maximum Working Pressure-PSI : 175 
  • Meter Type: No Meter 
  • Minimum Temperature - Celsius : 0.50 
  • Minimum Temperature-Fahrenheit: 33 
  • Outlet Connection Size: 3/4 IN 
  • Outlet Connection Type: Female Threaded 
  • Outlet Shutoff Valve Type: Quarter Turn Ball Valve 
  • Outlet Thread Type: NPT 
  • Part Number: 0122774 
  • Polymer Coating: No 
  • Pressure Operation: Continuous 
  • Protection Type: Backpressure and Back siphonage 
  • Seat Material: Engineered Plastic 
  • Series: LF909 Small 
  • Strainer: Yes 
  • Tradename: None


  • Compact for easy installation 
  • Unique patented air-in and water-out design provides high capacity relief valve discharge performance during emergency conditions 
  • Lead free construction 
  • Quarter-turn ball valves with tee handles Type: Kit 
  • Includes Strainer 

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