An image of a manhole, representing the cross-connecting pipes between potable water and contaminated water sources.

Many homes and commercial building have a backflow preventer valve. Properties that have large boilers, fire suppression systems, or irrigation systems, will most likely have a backflow preventer valve installed. These devices are installed in areas where municipal clean water supplies cross-connect with contaminated, waste water sources. The preventer valves keep these two water sources…

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