Wilkins 975 XL Backflow Preventer Replacement (Freeze Damage Repair)
On a recent service call completed in Lake Wales, Florida in February 2026, we located a 3/4-inch reduced pressure (RPZ) backflow preventer installed along the backside of a building that had been impacted by a hard freeze. When temperatures drop low enough, trapped water can expand inside the assembly and cause cracks in the valve body or internal components—creating a serious cross-connection risk.
After inspecting the unit up close, we confirmed the backflow was slightly cracked and not a safe candidate for rebuilding. With a cracked casting, the device can’t reliably protect against backsiphonage or backpressure, so replacement is the correct fix to restore dependable potable water protection.
We isolated the water supply, relieved pressure, and replaced the assembly with a new Wilkins 975 XL RPZ backflow preventer. To ensure long-term reliability, we also replaced the threaded nipples on both sides, then restored service gradually while performing a thorough leak check and operational verification.
Inspecting Valves & Connections
We started by inspecting the shutoff and connection points around the backflow setup. Corrosion and weather exposure can make fittings harder to service, so we verified the isolation points and planned the safest approach for removal and replacement.
Examining the Backflow Body
This close-up shows the backflow body surface and mounting area we checked during troubleshooting. We look for stress marks, damage, and wear that can indicate freeze expansion or compromised sealing surfaces within an RPZ backflow assembly.
Confirming Freeze Crack Damage
Here you can see the damaged area on the casing—evidence consistent with freeze-related failure. Once the body is cracked, a rebuild won’t restore structural integrity, so the correct solution is a full backflow preventer replacement.
Installing the New Assembly In-Line
This photo shows the new Wilkins 975 XL set in place with the shutoff valves accessible for service. We aligned the assembly carefully to support reliable backpressure and backsiphonage protection and to keep it ready for future testing.
Final Fit & Serviceable Layout
With the new RPZ installed, we ensure the handles, test cocks, and clearances are positioned for easy maintenance. Proper layout helps with routine backflow testing and keeps the system compliant and service-friendly.
System Restored & Verified
This wider view shows the completed setup after restoring water service. We brought pressure back gradually, checked every threaded joint (including the replaced nipples), and verified stable operation with no leaks—restoring full backflow prevention protection.