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The Watts BD911 (W/PRESS) 1/2 is a 1/2" backflow preventer with Press connections. It is rated to 100 psi and up to 212°F.
This 1/2 inch bronze combination dial set 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).
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