Watts 3/4 in. Bronze FPT x FPT Double Check Valve Assembly Backflow Preventer 007M3QT - The Home Depot

Watts 3/4 IN Bronze Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Tee Handles, Flood Sensor 009M3-QT-FS 3/4 R - The Home Depot

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0062020 - Watts 0062020 - 3/4 Double Check Valve Assembly (007M3-QT)

Woodford Add-On 3/4 in. Hose Thread Brass Double-Check Backflow Preventer 50H-BR - The Home Depot

Wilkins 3/4 in. Brass Reduced Pressure Principle Backflow Preventer 34-975XL2S - The Home Depot

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MOEN Backflow Preventer - 3-inch

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