There is a clip holding the cartridge in place. You need to remove that and then there is a little plastic throw away tool that comes with a new cartridge that you use to break the seals loose on the old cartridge....then you use a pair of channel locks to grab the stem and pull it out. The new cartridge should come with detailed instructions.
If it is a moentrol valve...the part number is 1225 and if it is a posi-temp it is a 1222. Moentrol you pull out to turn on and then left and right for temp adjustment. Posi-temp just turns to turn on and you turn from cold to hot to adjust through the temp range.
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Replaced mixing valve handle and when I shut it off still leaks.
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