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Watts 0386463 B911T-M3 1/2" Combo Backflow Preventer & Fill Valve

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Price: $120.80
Item Number: 9406
Manufacturer Name: Watts
Manufacturer Part No: 386463
Watts 0386463 B911T-M3 1/2" Combo Backflow Preventer & Fill Valve
Watts 0386463 B911T-M3 1/2" Combo Backflow Preventer & Fill Valve

Series B911, B911S Bronze Combination Fill Valve and Backflow Preventers are 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 Watts Model 9D backflow preventer and a bronze Watts Model 1156F feed water pressure regulator in one pre-assembled unit. Model B911 has union NPT x NPT connections. Model B911S has union solder x NPT connections.


The Series B911, B911S has a high capacity fill valve that provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems.


Maximum Pressure: 100psi (6.9 bar).


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