Any advice is greatly appreciated.

Watch the 1222 cartridge removal & installation video:

If you purchased your moen product at a retail store, you will find the model number on the side of the box:

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Webthe house is about 50 years old, and the faucet trim has the words dialcet and moen mueller on it.

Webthe instruction sheet looks like this:

I'm hoping that the cartridge is not a.

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