The Zurn Wilkins 720A Pressure Vacuum Breaker Assembly is used in high hazard applications for back siphonage protection. Applications are primarily non-potable residential and commercial irrigation systems. Designed for installation on irrigation water lines to protect against back-siphonage of contaminated water into the potable water supply. Assembly shall provide protection where a potential health hazard exists.
ASSE Listed 1020
Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
Sizes: 1/2", 3/4", 1", 1 1/4", 1 1/2"
Main valve body Cast Bronze ASTM B584
Fasteners Stainless Steel, 300 Series
Elastomers Silicone (FDA approved), Buna Nitrile (FDA approved)
Irrigation systems supplied by domestic or private potable water systems are considered to be a potential pollution hazard to the water supply. These systems must include protection to prevent possible backflow of irrigation water into the potable water supply.
Federal law requires a proper backflow device to be installed on any watering system to prevent contamination of the supply; whether it be pump or city water. Check your local water authority for installation requirements & codes. In many rural areas; specific requirements for landscape irrigation systems may not be covered in local plumbing codes and/or enforcement may be limited. HOWEVER...limitation in local authority does not alter the basic requirement for protection of the potable water supply.