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With the plastic attached to the Moen Positemp cartridge, use the plastic as a handle to pull the cartridge straight out.
Now note the rubber washer on the other side of the cartridge, notice the hole is on the right side. the point of mentioning this is, if the rubber washers come off, make sure you put the correct washer on the correct side of the cartridge.
under the rubber washer there is a hole in the plastic of the cartridge that lines up with holes in the rubber washers, so that you will have no trouble putting the rubber washers back on correctly. It is also important that the Moen Positemp cartridge be installed in to the shower body correctly.

Moen Positemp cartridge Repair a