0436090 (Ames-Deringer) | 1/2 Inch | Bronze Reduced Pressure Zone Backflow Preventer Assembly | Quarter Turn Ball Valve ShutoffThis 1 2 Inch Reduced Pressure Zone Backflow Preventer Assembly is Designed to Prevent The Flow of Polluted Water From Entering Into The Potable Water Supply Due to Backsiphonage And or Backpressure in Accordance With National Plumbing Codes And Water Authority Requirements. Its Compact Modular Design Facilitates Easy Maintenance With a Single Access Cover For In Line Repairs. It Can be Used in a Variety of Installations Without The Need of Any