Determining which Moen shower valve you have installed behind the wall requires removing the exterior handle and escutcheon trim plate to examine the exposed cartridge and brass body shape. If the handle rotates back and forth in an arc and pulls straight out to control volume, you have a Moen Posi-Temp valve utilizing the 1222 cartridge. If the handle operates with a twisting and pulling motion or utilizes a two-handle configuration, it corresponds to older legacy valve architectures requiring distinct identification.
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