Moen Posi-Temp Shower Cartridge Replacement — Tampa, FL (Late September 2025)

A stuck shower handle in the upstairs master bath was traced to a worn Moen Posi-Temp cartridge. Using professional plumbing diagnostics, we confirmed mineral buildup and wear inside the valve body, which prevented proper temperature and flow control. Our goal: restore smooth handle rotation, balanced water pressure, and accurate hot–cold mixing—without disturbing the finished tile.

After shutting off the water at the fixture stops, we removed the trim and handle, documented the condition, and prepped the work area. Tools on this job included a cartridge puller, adjustable wrench, channel locks, screwdrivers, plumber’s cloth, and silicone faucet/valve grease. Careful extraction protects the brass valve body and prevents collateral damage that could otherwise require a full shower valve replacement.

With the seized cartridge out, we cleaned the valve cavity to remove corrosion and hard-water deposits, lubricated the O-rings, and installed a new OEM Posi-Temp cartridge. We then reassembled the trim, restored water service, and verified smooth handle travel, stable temperature, and strong, even flow. This plumbing repair extends the life of the valve and helps prevent leaks behind the wall.

Below are in-progress photos from the service, with notes describing each step from a plumber’s perspective—highlighting best-practice techniques, proper tooling, and code-compliant workmanship.