Many of the plumbing systems in residential and commercial properties around the Minneapolis and St. Paul area are fitted with a backflow preventer valve. This device prevents contaminated water in sewers or septic tanks from flowing back up the pipes and mixing with clean water. Plumbing technicians like P&D Mechanical install backflow preventer valves in areas where clean and dirty water are likely to cross paths. If you own a large boiler, a fire extinguishing system, or an irrigation system, your plumbing system likely contains a valve.
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