We have a leaking bathtub faucet and need to replace the cartridge but we cant’t figure out how to remove the casing (estachian?) around it. I don’t know the brand or model number. Everything is stuck from the hard water. We’ve already replaced the faucet but that didn’t fix it. Any help is much appreciated!! 
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@jsotola we tried to clean it up, but everything is “cemented” on there. This is why I’m asking for help to get the casing off.– Laura GoldbergJan 16, 2019 at 0:43
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1 Answer
The stem is held in place by a u-shaped piece of metal. If you scrape through enough crud, you'll find the bottom of it on the outside of the metal cylinder. Pull it out with a pair of pliers. https://www.youtube.com/watch?v=ZkZad_sHQkQ about 0:50 in is what I'm talking about.
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Thank you. We got it out with a lot of force—now looking at a $975 estimate to replace the shower valve. Plumber said he probably wouldn’t have been able to get it out and we would have the same repair amount. Jan 17, 2019 at 21:31