Powers Commercial 390-803 Plunger Kit

The Powers Commercial 390-803 Plunger Kit, also identified by part number SH1432, is a critical internal service component for restoring the modulation accuracy of tempering valves. In commercial HVACR and plumbing systems, the plunger is responsible for the precise mechanical travel that balances hot and cold water streams. Over time, mineral scaling and thermal cycling can lead to plunger binding or bypass, resulting in unstable discharge temperatures. This Powers repair kit provides a direct OEM replacement to ensure the valve body maintains its low-lead compliance and 100% seating integrity. Cross-referenced with Grainger items 25CC62 and 25CC66, this kit is specifically engineered for high-demand environments where temperature and pressure regulation are paramount.

For contractors servicing LFMM-433, LFMM-434, or LFSH-1434 mixing valves, the 390-803 rebuild kit is the standard solution for addressing thermal creep or low-flow temperature fluctuations. Integrating the SH1432 plunger into your maintenance schedule prevents the common "stacking" effect found in older thermostatic installations, where the valve fails to respond to rapid inlet pressure changes. This assembly is designed for drop-in compatibility with Powers ETV400-10 and ETV400-15 series electronically tempered valves, ensuring the actuator can move the internal stem without excessive friction. By utilizing this commercial mixing valve part, technicians can reduce system downtime and eliminate the need for complete valve body replacements in potable water or hydronic loops.

• System Compatibility: Precision-fit for Powers ETV400-10, ETV400-15, LFMM-433, and LFSH-1434 mixing valves.
• Enhanced Regulation: Restores factory-standard modulation for stable temperature and pressure regulation in commercial loops.
• Internal Integrity: Replaces worn SH1432 plunger components to stop bypass leaks and internal valve binding.
• Reduced Maintenance: Utilizing an OEM Powers rebuild kit extends the service life of high-cost tempering valve bodies.

• Will this kit fix a mixing valve that is only outputting hot water? Yes, if the failure is caused by a seized or scaled plunger that can no longer move to the mixing position, this 390-803 kit is the correct repair solution.
• Is the SH1432 plunger compatible with lead-free valve bodies? Correct, this component is designed for use in modern LF series (Lead-Free) Powers valves and meets standard potable water requirements.
• Does this include the O-rings and seals? This kit focus is the plunger assembly; for a full top-to-bottom overhaul inclusive of all gaskets, standard practice is to verify the specific valve model serial for a comprehensive seal 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.