This standard applies to atmospheric type vacuum breakers that are single pipe-applied. The purpose of these devices is to provide protection of the potable water supply against pollutants or contaminants that enter the system due to backsiphonage through the outlet. Under backsiphonage conditions, a small amount of water is permitted to exit through the air ports.
ANSI/ASSE 1001-2008 history
2008ANSI/ASSE 1001-2008 Performance Requirements for Atmospheric Type Vacuum Breakers