LF919

Lead Free* Reduced Pressure Zone Assembly Backflow Preventers with Flood Sensor, Sizes 1/2 to 2 IN

  • Sensor on the relief valve for flood detection
  • Lead Free* cast copper silicon alloy body construction, two poppet-style check valves, replaceable check seats, and an intermediate relief valve
  • Maximum working pressure: 175 psi (12.06 bar)
  • Separate access covers for the check valves and relief valve
  • Bottom-mounted relief valve for reduced space requirements
  • Top-mounted test cocks reduce installation clearances and make testing easier
  • Innovative plastic seat guides and check valve plastic cover bushings for trouble-free guiding
  • Flood alert feature activated with add-on connection kit, compatible with BMS and cellular communication

Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF919

Approval/Certification Information

For product-specific approval information, please refer to the product’s specification sheet (see literature section above) or ask a Watts representative. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:


ASSE CSA FM Approvals NSF
UL ULC USC WQA