Honeywell FM911/U 1/2 inch Backflow Preventer with Automatic Boiler Feed Honeywell Item SKU - FM911/U EDP - 1157733 Out of stock Old Number FM911 Pressure regulating valve for automatic control of boiler feed water and other pressure reducing applications Especially constructed for expansion tank mounting - Fast fill - Built in check valve - Sweat unions or FIPS union connections Login for Your Price