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Testing a small backflow preventer on Saint Helena Highway

Typical St Helena Test

Pictured here is a typical test of a small (1") RP type backflow preventer on Saint Helena Highway. Saint Helena generally requires this type of device.

Repairing a 3" backflow preventer in South Napa

Leaking Backflow Repair

Pictured here removing the number 1 check valve of a Reduced Pressure Principle backflow preventer in South Napa. This device was leaking upon arrival.

A 4" backflow preventor install that replaced an old fire suppression line

Backflow Device Replacement

We removed a disintegrating backflow device, 7 feet deep in a concrete vault, and replaced it above ground with this beautiful device.