4-375DA (Wilkins) | 4 Inch | 375DA Reduced Pressure Principle Detector Backflow Assembly With Osy Gate ValvesThis 4 Inch 375DA Reduced Pressure Principle Detector Backflow Assembly Protects Against Backsiphonage And Backpressure of Contaminated Water in High Hazard, Fire Protection Applications. The 375DA Features a Metered Bypass to Effectively Detect Leaks And Any Unauthorized Water Use. Materials Include an Epoxy Coated Ductile Iron Body, And Stainless Steel Internals, Fasteners, Springs, And Sensing Line. The Zurn Wilkins Compound Check Provides Low