This is an above ground, 4" Reduced Pressure Principle backflow preventor that we replaced at a retirement community in North Napa.
This is a 6" Double Check with a detector bypass that we brought above ground, replacing an old fire service line at a retirement home in North Napa.
This is a 4" Reduced Pressure Principle Backflow Preventer that we brought above ground, replacing at an insurance company in Central Napa.
A 4" Double Check backflow device with a detector assembly, brought above ground, replacing a disintegrating fire line at a Napa Dental Office.
This is a 3" Reduced Pressure Principle backflow preventor in a warehouse at Hall Winery near Rutherford, Napa Valley.
Pictured here is a typical 1" device replacement at a residence in Napa. The device type is a double check and these are generally below ground.
We performed a cleaning on this 8" Reduced Pressure Principle backflow preventer used for fire suppression at a warehouse in Napa.
Testing a 3/4" bypass backflow preventer that's attached to a larger fire line. These are used to detect leaks or unauthorized use.