The inspection and testing of all backflow devices is required to ensure water flows away from a building rather than towards a building. Backflow testing includes inspection of Double checks, Pressure Vacuum Breakers, Rain/Freeze Sensors and all fire line backflows.

The pressure vacuum breakers consists of a check device (valve) and an air inlet, which is usually a chamber vented to the atmosphere.

The inspection and testing of all backflow devices is required to ensure water flows away from a building rather than towards a building. Backflow testing includes inspection of Double checks, Pressure Vacuum Breakers, Rain/Freeze Sensors and all fire line backflows.

This principal not only utilized a double checks (valve) system but also a pressure monitored chamber between the two check valves.

The inspection and testing of all backflow devices is required to ensure water flows away from a building rather than towards a building. Backflow testing includes inspection of Double checks, Pressure Vacuum Breakers, Rain/Freeze Sensors and all fire line backflows.

Devices designed to prevent backflow from happening and thus protect water supplies from becoming contaminated.