A 2 inch backflow preventer is a 2-inch bronze double check backflow device with two brass ball valves for easy shut-off and four ball valve test cocks. It is used to stop the flow of contaminated water should it reverse direction in a situation referred to as backflow. The backflow preventer keeps the water from

It hasn’t been all that long ago that a residential backflow preventer wasn’t required in city neighborhoods.  The main concern over backflow, it was believed, came from industrial and commercial facilities and not, it was believed, from residential homes. Then chlordane was siphoned through a hose at a residence in Roanoke, Virginia, contaminating the water

A sprinkler system backflow valve usually sits between your home’s main water supply connection and your sprinkler system.  The purpose is to prevent the backwards flow of water which can pollute the potable water supply with contaminants. Pollutants from the gardening area, or lawn area, can flow back into the city’s water supply if a