WA911S MFG #: 911S-1/2
  • Brand: Watts®
  • Nominal Size: 1/2 Inch x 1/2 Inch
  • Pressure Rating: 100 psi
  • Body Material: Bronze
  • Application: Commercial, Residential
  • End to End Distance: 8-1/2 Inch
This 1/2 inch bronze combination fill valve and backflow preventer is for use in commercial and residential hydronic heating systems to provide make-up water to the boiler, and prevent backflow when supply pressure falls below system pressure. It consists of a bronze backflow preventer, model 9D and a bronze feed water pressure regulator, model 1156F, in one pre-assembled unit. The high capacity fill valve provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems and has 1/2 inch union solder inlet x NPT threaded outlet connections. The maximum pressure is 100 psi (6.9 bar).
  • Features and More


  • Pre-Assembled for Ease of Installation
  • Easy Service Accessibility
  • High Capacity Fill Valve for Quick System Filling and Purging


    Backpressure and Backsiphonage Protection, High Capacity Fill Valve, Pre-Assembled Unit