A backflow preventer is a mechanical device that allows water to flow in only one…
If you have an irrigation system in the Raleigh-Durham area, Greenville, or Spartanburg, your RP backflow preventer (Reduced Pressure Principle assembly) is a critical component required by local codes to protect your home’s drinking water from contamination. In North Carolina and South Carolina, winter freezes can crack brass bodies, blow test port caps, or damage internal checks—leading to expensive repairs or full replacement.
The smart approach is seasonal removal: take it out in late fall when you feel like you’re mowing the lawn for the last time before spring, and reinstall around mid-March once freezing temperatures are no longer a threat. This simple routine prevents damage and keeps your system compliant.
Why Winterize Your RP Backflow Preventer?
Freezing water expands inside the device, often causing cracks in the brass housing, leaks at fittings, or failure of the relief valve. A damaged RP backflow preventer can lead to:
- Water contamination risks
- Flooding or irrigation system downtime
- Fines for non-compliance
Replacement costs add up quickly and can be very expensive. Every backflow replacement is different—depending on the model, location, access, piping condition, and local permitting requirements—so total expenses vary widely and often run much higher than people expect. Annual testing (required by law) is far less costly, so prevention through proper winterization is always the smarter and more affordable choice.
Step-by-Step: How to Remove Your RP Backflow Preventer for Winter
Most residential irrigation setups include unions for easy disconnection. Safety first: wear gloves and eye protection, and always shut off water before starting.
Shut Off the Water Supply
- Close the main irrigation shut-off valve (often near the house or in a valve box) and the isolation valves on both sides of the backflow preventer.
Drain the System
- Open the test cocks or drain valves to release pressure. If your system has a blow-out port, use low-pressure compressed air (30–50 PSI) to clear residual water.
Disconnect the Unions
- Use adjustable wrenches to loosen the union nuts counterclockwise. Support the device as it separates from the pipes.
Remove and Store
- Carefully lift out the RP assembly, tilt to drain any remaining water, and store it indoors in a dry, non-freezing location (garage, basement, or utility room).
The process usually takes 30–60 minutes for most homeowners.
Step-by-Step: How to Reinstall Your RP Backflow Preventer in Spring
Reinstall around mid-March in Raleigh, Durham, Greenville, and Spartanburg—after checking that no more freezes are forecast.
Inspect the Device
- Look for cracks, corrosion, or debris from storage. Clean threads if necessary.
Reconnect to Pipes
- Align the backflow with the unions, hand-tighten first, then secure with wrenches. Make sure the flow-direction arrow points toward the irrigation system.
Open Valves Slowly
- Gradually reopen the isolation valves, then the main supply to avoid water hammer.
Bleed Air and Check for Leaks
- Briefly open test cocks to release trapped air. Run the system and inspect all connections.
Schedule Annual Testing
- Backflow preventers must be tested and certified every year—don’t skip this step.
Reinstallation typically takes 30–45 minutes.
Annual Backflow Testing – Required and Hassle-Free
North Carolina and South Carolina require annual certification of RP backflow preventers to verify they prevent contamination. Testing checks the check valves, relief valve, and overall function.
At Modern Plumbing and Backflow, we make compliance easy. In spring (or fall), simply leave your backflow device at your door—we’ll pick it up, reinstall it, test it, certify it, and put your irrigation system back online, often all in one visit and without you needing to be home. We serve Raleigh, Durham, Greenville, Spartanburg, and surrounding areas.
Protect Your System and Save Money
Winterizing your RP backflow preventer avoids potentially very expensive replacement costs while keeping your water safe and your irrigation compliant. Whether you’re handling removal yourself or want professional help, we’ve got you covered.
Call or text us today at https://www.modernbackflow.com/ for:
- RP backflow testing in Raleigh
- Backflow winterization and spring startup in Durham
- Irrigation backflow service in Greenville
- Backflow certification in Spartanburg
Your system—and your wallet—will thank you. Reach out now!
