Harris Plumbing & Heating offers installation, repair, testing, maintenance and inspection services for backflow preventer devices throughout the NY Metro area (Brooklyn, NYC, Queens and the Bronx), and we're ready to respond to your service request soon. These devices are a critical life and safety feature that can prevent waste water from flowing back into your fresh drinking water supply. By preventing this from happening, it eliminates the risk of a serious water contamination problem from occurring. We Offer Installations, Maintenance, Alterations & Repair. Sprinkler Water Mains & Meters, Complete Sprinkler & Stand Pipe Systems, Violations Removed, Fire Pumps, Backflow Testing, Monthly Inspections, Siamese Test Services.