800M4QT

Antisiphon 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
  • Freeze alerts feature available with add-on connection kit for irrigation management systems
  • Health hazard protection level
  • Acetal bonnet acts as "freeze plug" to prevent body damage
  • Compact and designed for easy maintenance
  • Test cocks are positioned for easy testing and winterization
  • Bronze body construction, silicone rubber check valve disc, plastic check valve seat, stainless steel springs, and a lightweight plastic disc float

Select options below to identify the UPC, Order Code, and Repair Kit for a specific 800M4QT

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