A 1 Backflow Preventer is a double-check valve assembly designed to prevent dangerous and contaminated backflow of polluted water from entering into the potable water supply.  This can happen due to backpressure or back-siphonage.

A 1 backflow preventer is generally made of bronze construction, test cocks, and valve shutoffs to insure that your water flows in exactly the way it is supposed to flow.

Annual testing is required on all backflow preventers, and that annual testing must be conducted by a licensed and certified backflow testing company like City Backflow Testing in Texas.