Wilkins 34-720A Pressure Vacuum Breaker Assembly - 3/4"

Wilkins 34-720A Pressure Vacuum Breaker Assembly - 3/4" icon_image_enlarge.png
  • Model #: 34-720A
  • Part #: 158894
  • Manufacturer: Wilkins

This is a genuine Wilkins 34-720A Pressure Vacuum Breaker Assembly – 3/4”.

  • 3/4” FNPT Ball Valves

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Designed for installation on potable water lines to protect against backsiphonage of contaminated water into the potable water supply. Assembly shall provide protection where a potential health hazard exists.


  • ASSE ® Listed 1020
  • IAPMO® Listed
  • CSA ® Certified
  • Approved by the Foundation for Cross-Connection
  • Control and Hydraulic Research at the University of Southern California


  • Main valve body: Cast Bronze ASTM B584
  • Fasteners: Stainless Steel, 300 Series
  • Elastomers:
    • Silicone (FDA approved)
    • Buna Nitrile (FDA approved)
  • Polymers:
    • Polypropylene (FDA approved)
    • Delrin® (FDA approved)
  • Springs: Stainless Steel, 300 series


  • Maximum working water pressure 150 PSI
  • Maximum working water temperature 110°F
  • Hydrostatic test pressure 300 PSI
  • End connections threaded ANSI B1.20.1
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Additional Information

List Description
  • 3/4” FNPT Ball Valves
Part #




Model #


Wilkins 34-720A Pressure Vacuum Breaker Assembly - 3/4"

  • From George Lis at 7/10/17 4:34 PM
    • Q: Vacuum breaker 3/4 M# 720 A. Can tell why on starting initial water start up ,the water kept coming out the top of canopy until the rest of the line was opened then it stopped.Just curious as to why that would happen.Thanks
    • A: The purpose of the initial leak is to let you know that the air inlet valve is fully open.

      The air inlet valve will open when the pressure in the body is no less than
      1.0 psi above atmospheric pressure. The air inlet valve will be fully open when the water drains from the body.

      If you have any other questions our experts are here to help! Call or text 800-518-5388
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