
WATTS® 88005793 B911 Threaded Backflow Preventer
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 BD1156F, 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 Viega ProPress inlet x NPT threaded outlet connections. The maximum pressure is 100 psi (6.9 bar).
Orders placed by 2:00pm EST will ship same day, except on holidays.
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Product overview
Specifications
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Delivery & Returns
Orders will ship same day if received by 2pm EST.
Upcoming holiday closures: May 25, 2026
All returns are inspected on receipt; credit is issued after condition is confirmed. Credit is issued only for items returned in original, saleable condition after inspection.
FINAL SALE ITEMS ARE NOT ELIGIBLE FOR RETURNS OR EXCHANGES.
