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Thanks, everybody! I've found the right part and will order the replacement this week.

John,
Thanks so much! The faucet looks like this one from the Moen web site:
Moen Replacement Parts - Order Parts

I'm willing to try to install the new cartridge, but I think the plumber will...

I have a one-handle bathroom sink faucet (Moen, original to the house, 12 years old).

In the last few weeks, I noticed the faucet drips, so I put a bucket under it to see the volume. After about...