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Backflow Preventer with atmospheric vent
The BP900 backflow preventer is designed for continuous pressure applications on small supply lines. It uses an intermediate vacuum breaker to protect against backflow and back siphonage of contaminated water into portable water supplies.
Product Data and Specifications-Backflow Preventer with Intermediate Atmospheric Vent for Continuous Pressure Service - Sparco
Product Data and Specifications-Product Data for BP900 Series Backflow Preventer with Intermediate Atmospheric Vent for Heating Systems (English)
Product Data and Specifications-Submittal Sheet for Dialset Boiler Fill Valve, FM911 = VF06 + BP900 (English)