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Watts 1 LF909-QT-FS Small Series 1 in. Silicon Bronze Reduced Pressure Zone Assembly Backflow Preventer

Mfr. Model #:
1 LF909-QT-FS (F391009)
KR Part #:
17.00 lbs
Usually Ships in 2 Weeks
Now Only!

Diameter of inlet and outlet is 1 inch. Prevents polluted water from entering a potable water supply. Complies with water authority requirements. 


Technical Specifications

Inlet Port: 1 inch
Outlet Port: 1 inch
Max Temperature: 140 degrees F
Max PSI: 175

Product Description

1" Backflow Prevention Valve

Inlet and outlet both measure 1 inch in diameter. Constructed with silicon bronze and 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: 098268051186 
  • Elbow Fitting: No 
  • Hazard Protection Level: Health Hazard 
  • Hot And Harsh Water: No 
  • Hydrant Connection: No 
  • Inlet Connection Size: 1 IN 
  • Inlet Connection Size-Metric: 25 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: 1 IN 
  • Outlet Connection Type: Female Threaded 
  • Outlet Shutoff Valve Type: Quarter Turn Ball Valve 
  • Outlet Thread Type: NPT 
  • Part Number: 0391009 
  • Polymer Coating: No 
  • Pressure Operation: Continuous 
  • Protection Type: Backpressure and Backsiphonage 
  • Seat Material: Engineered Plastic 
  • Series: LF909 Small 
  • Strainer: No 
  • Tradename: None 
  • Type: Kit 


  • Unique patented air-in and water-out design provides high capacity relief valve discharge performance during emergency conditions 
  • Quarter-turn ball valves with tee handles 
  • Horizontal or vertical (up or down) installation 
  • No special tools are required for servicing 
  • Replaceable seats 
  • Top mounted test cocks 
  • Compact for easy installation 
  • Single access cover 
  • Lead free bronze body 


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