Watts Comb Fill Valve/Backflow Preventor,1/2In B911-M3

Watts B911-M3 Comb Fill Valve/Backflow Preventor, 1/2in

Combination backflow preventer and feed water pressure regulator in one pre-assembled unit, this WATTS boiler feed valve with backflow preventer is for use in residential and commercial hydronic heating systems. Model provides make-up water to the boiler and can prevent backflow when the supply pressure falls below the system pressure.