Photo 1 of 1/2" 9D-M3 Backflow Preventer, Brass Dual Check Valve with Intermediate Atmospheric Vent, 1/2 Inch back flow preventer valve Female Union, Vertical or Horizontal Install

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Photo 1 of 1/2" 9D-M3 Backflow Preventer, Brass Dual Check Valve with Intermediate Atmospheric Vent, 1/2 Inch back flow preventer valve Female Union, Vertical or Horizontal InstallPhoto 2 of 1/2" 9D-M3 Backflow Preventer, Brass Dual Check Valve with Intermediate Atmospheric Vent, 1/2 Inch back flow preventer valve Female Union, Vertical or Horizontal Install