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Wilkins 720A 3/4 inch PVB Backflow Preventer

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Original price $ 72.43
Current price $ 70.36
SKU 34-720A

Wilkins 720A 3/4 inch PVB Backflow Preventer

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.

Features / Benefits

  • Tapped ball valves with threaded test cocks allows installation in either position allowing direct replacement of other manufacturer's PVB, regardless of orientation
  • Bronze Bonnet for greater strength and durability
  • Serial Number visible in any installed orientation
  • Top access for easy maintainability
  • Protects against backsiphonage
  • Typical application: irrigation system
  • Owner must protect from freeze damage
  • Maximum working water pressure: 150 PSI
  • Maximum working water temperature: 110°F
  • Hydrostatic test pressure: 300 PSI
  • End connections threaded: ANSI B1.20.1


  • The Pressure Vacuum Breaker shall be ASSE 1020 approved, and supplied with full port ball valves. The main body and bonnet shall be bronze (ASTM B584), the loaded-air inlet shall use an silicone elastomer spring and seat disc. The entire assembly shall be accessible for maintenance and testing without removing the device from the line. The Pressure Vacuum Breaker shall be a WILKINS Model 720A.


  • 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

Standards Compliance

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

Typical Installation

Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be mounted at a minimum of 12" (305mm) above the highest piping or outlet downstream of the device. Install with adequate drain and sufficient side clearance for testing and maintenance. The installation shall be made so that no part of the unit can be submerged. A pressure vacuum breaker cannot be installed where back-pressure could occur or where spillage of water from vent could cause damage.

Wilkins Model 720A Capacity Diagram


 Wilkins 720A-075 3/4 inch PVB Backflow Preventer