The Zurn Wilkins 350ADA Double Check Detector Backflow Preventer is ideal for fire protection applications, with a metered by-pass to detect leaks and unauthorized water use. Used in low health hazard applications.

Product Resources

Spec Sheets & Install

BIM / 3D Models / 2D Drawings

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Features And Benefits

  • Short lay-length for small space installation
  • Reliable performance and improved flow characteristics from patented Compound Check
  • Resilient wedge OS&Y gate valves standard
  • Approved in horizontal and vertical positions
  • Available in flanged, grooved, or grooved x flanged end connections for installation versatility
  • No threads or taps in body or cover, eliminating exposure to corrosion
  • Single access cover reduces maintenance down time
Lead Free
Retrofit or Replacement
Zurn Wilkins

Backflow Attributes

  • Grooved for steel pipe, flanged
  • Epoxy coated ductile iron
  • 2-1/2"*, 3"* , 4", 6", 8", 10"
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What's the difference between the 350ADA and the 350DA?

  • ​The 350ADA and the 350DA are both Double Check Detector Assemblies.  The 350DA utilizes shut-off valves that are attached to the main body via flanges.  The 350ADA utilizes grooved couplings for the attachment of the shut-off valves.  Therefore, due to the elimination of the flanges, the 350ADA is lighter in weight than the 350DA.
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