RPZ backflow preventer replacement: the finished job
Bright brass, green shutoff handles at each end and a drain funnel underneath. This is the new RPZ we put in the same Loudoun County basement as our old RPZ photo.
5.0 stars across 1,130 reviews
Get your price in writing
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, and we will tell you honestly when we can get there.
Our own plumbers, our own trucksNobody here is a subcontractor with a magnet on the door
The price is settled before the workYou see the number in writing before anything is taken apart
From one of our jobs
A new RPZ backflow preventer, just installed
Right now: Look under your backflow preventer. Water dripping or spraying from the relief port means a part inside is failing.
The handles at each end are the shutoffs we use to test it. The small brass ports on the side are where the test kit hooks up. The funnel underneath is the air gap: when the relief valve opens, the water drops through it to a drain instead of onto your floor.
We replace an RPZ when it keeps dumping water, fails a test and can’t be rebuilt to pass, or is old enough that parts are hard to get. Once it’s in, we test it right away and send the passing result to your water utility, so you start the year clean.
Quick answers
What people ask about replacing a backflow preventer
When should an RPZ be replaced instead of rebuilt?
When it keeps failing, keeps dumping water after a rebuild, or parts for it are hard to find. Until then a rebuild is usually the right call.
Why is my RPZ dumping water?
The relief valve opens when a check inside isn’t holding or the pressure on the street side drops. A steady drip usually means a worn part.
Does a new backflow preventer need to be tested?
Yes. A new one gets tested when it goes in, and the result is filed with your water utility.
Do I need a drain under my RPZ?
It needs somewhere for water to go when the relief valve opens. The funnel and a drain line keep it off your floor.
Who replaces backflow preventers in Northern Virginia?
Call SwiftPro at (703) 997-9757. Our own licensed plumbers test, rebuild and replace backflow preventers across Northern Virginia.
Seeing this at your house?
Tell us what you’re seeing. We’ll tell you what it is and what the fix costs, in writing.
What it costs
What we charge to test and replace a backflow preventer
Read and watch next
More on this from SwiftPro
More real photos from our jobs
Seeing this at your house?
Want us to take a look at yours?
Tell us what you’re seeing. We’ll give you a time and a price in writing before any work starts.
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