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A backflow preventer is the valve that keeps dirty water from running backward into your home's clean supply. When its parts wear out it stops protecting you, and the fix is a new unit, fitted and tested.
How the yearly backflow test works, step by step: our full guide. Backflow testing procedure.
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It opens in a utility closet lined with foil insulation, where the old backflow preventer sits on the water line with a yellow tag hanging off it and an orange bucket underneath to catch drips. A tech works the small test cocks on the body of the valve, the ports a tester uses to check it's still holding.
Then the new preventer comes out of its box on a tile floor, the techs in shoe covers so the house stays clean. It's set in place on the line and joined with a press tool, which crimps the fittings tight without an open flame in a closet full of insulation.
The text over the clip lays out the reason for all of it: worn or damaged parts can let the device slip, and a new one keeps your drinking water protected.
Look for steady dripping from the relief port, a bucket that keeps filling, rust or cracks on the body, or a failed yearly test. A tech can sometimes rebuild the inside, but on an older unit with worn parts a new preventer usually costs less over time and passes the test cleanly.
Us. We made this video (Backflow Preventer Replacement, Old Unit Out and New One In). We're SwiftPro Heating, Cooling & Plumbing, a Virginia Class A licensed contractor (#2705192276) with offices in Chantilly and Ashburn, working across Fairfax, Arlington, Loudoun, Prince William, Fauquier and Stafford counties, and we're rated 5.0 stars across 1,138 reviews on Google, Angi, Yelp, the BBB and Facebook. See AC replacement at SwiftPro.
A diagnostic is a flat $99. You get the repair price and the replacement price in writing. Right now: a free furnace with a new AC, on estimates written this week. See every deal.
We answer day or night, and we will tell you honestly when we can get there. Book online and pick your time, or call (703) 997-9757.
Want it done at your place? See Backflow Testing and Preventers at SwiftPro or call (703) 997-9757.
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SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276