LF800M4FR

Lead Free* Freeze Resistant Pressure Vacuum Breaker Backflow Preventers with Freeze Sensor

  • 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
  • Unique built-in relief valve in plastic float protects assembly during sudden freeze conditions by relieving pressure caused by ice
  • Replaceable plastic seat
  • Test cocks are positioned for easy testing and winterization
  • O-ring bonnet seal reduces possibility of fouling
  • Lead Free cast copper silicon alloy body construction, silicone rubber check valve disc, plastic check valve seat, stainless steel springs, and a lightweight plastic disc float
  • Freeze alerts feature available with add-on connection kit for Wi-Fi networks, building management systems (BMS), and irrigation management systems (IMS)

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