Combination Backflow Preventer and Hot Water Boiler Fill Valve
For use on residential boiler feed lines to prevent backflow when supply pressure falls below system pressure. This series combines the Watts 9D Backflow Preventer/Intermediate Atmospheric Vent (for use in hot or cold water lines under continuous pressure) with the Watts No. 1156F Feed Water Pressure Regulator, in one pre-assembled unit.

Specifications
1/2"" x 1/2"" threaded connections.

Length 8-1/2"". Weight 4 lbs.

No. 9D, Max. emergency backflow temp. 250°F.

No. 9D, Max. pressure 175 psi.

No. 1156F, Max. temperature 212°F.

No. 1156F, Max. pressure 100 psi.

Features:
Pre-assembled for convenience

High capacity performance

Easy service accessibility

Easy purging mechanism

Options:
(Suffix)
S - for 1/2"" union sweat inlet x 1/2"" threaded outlet

QT - with built-in quarter turn shutoff on threaded union inlet

QT-S - with built-in quarter turn shutoff on sweat union inlet.

Prefix "B" - for bronze body regulator

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