WATTSSKU: 1728248

WATTS® F391008 LF909-FS Inline Reduced Pressure Zone Backflow Preventer

$1,927.00
Low Stock (3)

WATTS® LF909-FS 3/4 in Lead-Free Reduced Pressure Zone Backflow Preventer (F391008) — protects potable water supply from back siphonage and back pressure in continuous-pressure piping and health-hazard cross-connections.

Features a patented air-in/water-out relief valve design, quarter-turn ball valve shutoffs with tee handles, replaceable check modules and seats, and top-mounted test cocks. Installs horizontally or vertically with no special tools required.

Built-in SentryPlus Alert flood sensor detects excessive relief valve discharge. With an optional add-on connection kit, the sensor sends alerts via BMS or cellular to notify personnel of potential flooding.

Shipping policy

Orders placed by 2:00pm EST will ship same day, except on holidays.

More Details

Product overview
  • Lead free construction
  • No special tools are required for servicing
  • Compact for easy installation
  • Horizontal or vertical (up or down) installation
  • Top mounted test cocks
  • Features a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve
  • 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
  • Ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards and from other contaminants
Specifications
Manufacturer Part Number F391008
UPC 98268517613
Overall Dimensions 9-7/8 in H x 18-1/16 in W x 3-7/8 in D
Material n/a
Domestic or Import Domestic
End Style n/a
Type Reduced Pressure Zone | Quarter-Turn Ball Valve
ADA Compliance n/a
Warning n/a
Standards and Approvals N-No UL Code Rating | ASSE 1013 | cCSAus B64.4 | AWWA C-511-92 | FCCCHR of USC Manual Section 10 | IAPMO (UPC) | SBCCI (Standard Plumbing code) | NSF/ANSI 691-G | PROP65
Resources
Delivery & Returns

Orders will ship same day if received by 2pm EST.

Upcoming holiday closures: May 25, 2026

All returns are inspected on receipt; credit is issued after condition is confirmed. Credit is issued only for items returned in original, saleable condition after inspection.

FINAL SALE ITEMS ARE NOT ELIGIBLE FOR RETURNS OR EXCHANGES.

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