How to remove a broken 1222 PosiTemp cartridge
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This article will explain the process of removing a PosiTemp when the brass stem has broken or pulled out of the middle of the cartridge body.
When a shower handle becomes hard to rotate, it can put additional stress on the brass stem of the PosiTemp cartridge. This will occasionally cause the brass stem to break off, leaving the white body or "shell" of the cartridge stuck inside the brass valve body. In that situation, replacing the 1222 cartridge can be difficult. Below are Moen's recommendations for the best method of removing the shell from the valve.
Preparation: Shut off the water supply to the valve