LF800M4QT

Lead-Free* Antisiphon Pressure Vacuum Breaker Backflow Preventers with Freeze Sensor, Sizes: 1/2 IN - 2 IN (15mm – 50mm)

  • Sensor on PVB signals when temperature nears the freezing point
  • Freeze alerts help extend use of the PVB device by reducing damage and repair
  • Available freeze sensor connection kit to activate a monitoring system that trigger alerts for low and freezing temperatures
  • Health hazard protection level
  • Acetal bonnet acts as freeze plug to prevent body damage
  • Seat disc is silicone rubber for durability, and an O-ring bonnet seal resists fouling
  • Readily accessible test cocks for testing and winterization
  • Designed for ease of maintenance with a replaceable plastic seat
  • Freeze alerts feature available with add-on connection kit for Wi-Fi networks, building management systems (BMS), and irrigation management systems (IMS)

Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF800M4QT

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