Description
0887726 800M4 Backflow Valve PVB Repair Kit — 1/2"-3/4" Freeze Resistant Retrofit
The 0887726 800M4 Backflow Valve PVB Repair Kit is a complete rebuild solution for 800M4QT and LF800M4QT Pressure Vacuum Breakers. This kit includes all internal wear components — seals, springs, poppets, and canister — plus the freeze-resistant retrofit to convert your existing 800M4QT to an 800M4FR. Restore proper backflow prevention and pass your annual inspection with confidence.
Key Features
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Complete Rebuild Kit: Includes bonnet O-ring, check seat, poppet assembly, spring, check disc, and all seals — everything that wears out.
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Freeze-Resistant Retrofit: Converts standard 800M4QT to freeze-resistant 800M4FR configuration for cold climate protection.
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1/2" to 3/4" Compatibility: Fits both 1/2-inch and 3/4-inch PVB models — one kit covers multiple installations.
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OEM-Spec Components: Manufactured to the same tolerances as OEM Watts/Febco parts for reliable sealing and smooth operation.
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Annual Test Ready: New internal components ensure your PVB passes the required annual backflow prevention test on the first try.
Compatibility
| Model |
Size |
Notes |
| 800M4QT |
1/2" - 3/4" |
Standard PVB, non-freeze |
| LF800M4QT |
1/2" - 3/4" |
Lead-free version |
| 800M4FR (after retrofit) |
1/2" - 3/4" |
Freeze-resistant after kit install |
Frequently Asked Questions
Q: How do I know if my 800M4 needs a rebuild?
A: Signs include: dripping from the bonnet during normal operation, failure to hold pressure during annual backflow testing, water hammer when irrigation cycles off, or visible corrosion/cracking on the bonnet.
Q: Can I install this kit myself?
A: Yes — but note that after any PVB repair, most jurisdictions require a certified backflow tester to re-certify the device. The physical rebuild takes about 30 minutes with basic tools. The annual test must be performed by a licensed professional.
Q: What does the freeze-resistant retrofit do?
A: The FR kit replaces internal components with a design that automatically drains residual water when system pressure drops, preventing freeze damage in cold climates. If your PVB is exposed to freezing temperatures, this retrofit is essential.
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