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.
Materials
WARNING!
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.
PIPE SIZE | 5 FT/SEC. | 7.5 FT/SEC. | 10 FT/SEC. | 15 FT/SEC. |
---|---|---|---|---|
1/8" | 1 | 1 | 2 | 3 |
1.4" | 2 | 2 | 3 | 5 |
3/8" | 3 | 4 | 6 | 9 |
1/2" | 5 | 7 | 9 | 14 |
3/4" | 8 | 12 | 17 | 25 |
1" | 13 | 20 | 27 | 40 |
1 1/4" | 23 | 35 | 47 | 70 |
1 1/2" | 32 | 48 | 63 | 95 |
2" | 52 | 78 | 105 | 167 |