How Much Does It Cost to Fix a 2 Inch Backflow Preventer?

Most 2-inch backflow repairs are a rubber rebuild kit, which costs $33 – $256 in parts depending on brand and whether you rebuild one check or the whole assembly. A certified tester typically charges $150 – $400 in labor to install it and retest, so a standard 2-inch rebuild usually comes to $183 – $656 all in. Replacing the entire assembly instead runs $582 – $2,411 for the device plus $400 – $1,299 labor.

Repair is almost always cheaper. A 2-inch rebuild kit costs $33 to $256 in parts, while a complete 2-inch assembly starts at $582. Replacement makes sense when the body is cracked or corroded through, when the device is obsolete and parts are no longer made, or when it has failed repeated tests after multiple rebuilds.

It depends on the model and on what the kit covers. A single-check rubber rebuild costs less than a complete kit for both checks and the relief valve, and a 2" LF009 kit is not the same as a 2" 007 kit. The rebuild kit table on this page shows current prices, and the repair parts finder lists every kit for your exact model. You can also send us the tag details and we'll quote it.

Complete 2-inch backflow assemblies run $582 – $2,411, depending on the brand and type. Double check assemblies sit at the lower end and reduced pressure zone (RPZ) assemblies at the higher end, and we quote the exact price for your model. Add $400 – $1,299 in typical labor for removal, installation, and certification testing.

Larger devices use more brass or stainless, bigger check modules, and heavier relief valves, so the parts themselves cost several times more. Two-inch and larger devices are also usually commercial or irrigation installations that need shutoffs, drainage, and sometimes a crane or second technician, all of which increase labor.

In California and most jurisdictions, yes. The device must be tested and certified by a licensed backflow assembly tester after any repair, and that certification gets filed with your water purveyor. You can buy the parts yourself, but the repair and retest generally must be documented by a certified tester.

Rubber. First and second check discs, O-rings, and the relief valve seat harden and wear out, which is what causes most failed annual tests. These are inexpensive parts. Freeze damage to the body and springs is the other common failure and is far more expensive because it usually means replacement.

An annual certification test typically runs $45 – $125 depending on the area and whether the tester is already on site. If the device fails, the tester will quote the repair separately. Testing is required annually by most Northern California water purveyors.