Watts 0125122 Repair Kit

The Watts 0125122 Repair Kit is the direct professional-grade solution for servicing 3/4 inch Watts U5B water pressure reducing valves. Engineered for Lead Free applications, this PRV repair kit includes the essential internal components required to restore factory-spec pressure regulation and prevent thermal expansion issues. As the official replacement for Watts 0861465 (and 861465), this kit addresses the common failure points of the U5 Series, particularly degraded diaphragms and worn disc assemblies that lead to pressure creeping and hammer. When performing a Watts U5 series rebuild, using this OEM-spec 0125122 total integrated engine ensures the seat and stem interface provides a drip-tight seal under high-flow demand. Precise tolerances on the high-temperature diaphragm prevent bypass leakage, maintaining consistent downstream PSI even in variable municipal water systems. This kit is a mandatory stock item for contractors managing Lead Free plumbing system maintenance.

• Ensures compliance with Lead Free plumbing codes for potable water applications.
• Restores U5B pressure reducing valve accuracy to prevent fixture damage from high-pressure surges.
• Includes the complete internal module for a faster, one-step overhaul compared to individual component sourcing.
• Compatible with legacy Watts 0861465 configurations, streamlining inventory for older installs.

How do I fix a Watts U5B valve that is leaking from the vent hole?
Leaking from the spring cage vent usually indicates a perforated diaphragm. Installing the 0125122 repair kit replaces the entire diaphragm and disc assembly, sealing the upper chamber from the flow path.

Is the Watts 0125122 kit compatible with both U5 and U5B models?
Yes, this kit is the designated Watts U5 replacement part for 3/4" units, specifically updated to serve as the functional replacement for the older 0861465 part numbers.

What are the signs that a PRV needs a rebuild?
If you observe high static pressure in the building, noticeable "water hammer" during valve closure, or whistling through the pipework, the internal seat and diaphragm are likely compromised and require a full rebuild with this OEM repair kit.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.