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My bathroom sink cold water faucet was leaking into the cabinet (related post).

I took apart the faucet stem to see if there was a washer I could change and I do not understand what I am looking at (see photo).

I do not see a washer. What part of this do I change? If it is the little black o-ring, how do I measure it to buy a new one?

stem

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    You must replace the entire cartridge. - Take your faucet make and model to a plumbing supply outlet and they will identify the replacement cartridge you need. - They often come in packs of two, and plumbers recommend replacing both hot and cold; if one is worn out the other will surely fail soon. Oct 26, 2021 at 21:55
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    @Yehuda_NYC Those cartridges usually cost about $9 bucks a piece. That will be cheaper than a new faucet and faster to install than a new faucet.
    – JACK
    Oct 27, 2021 at 0:28
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    @A.I.Breveleri make that an answer!
    – FreeMan
    Oct 27, 2021 at 13:05
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    @Yehuda_NYC We'll be here... good luck.
    – JACK
    Oct 27, 2021 at 14:06
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    @Yehuda_NYC I think the idea of replacing semi-expensive cartridges is aimed at me. Replacing the entire faucet can be quite an adventure, depending upon how confined the space is underneath and how physically agile is the person doing the replacement. The older I get, the more I'm willing to spend to not be under the sink. Give me a few more years and I'll gladly pay more than the faucet is worth to not be under the sink. Oct 29, 2021 at 4:17

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You must replace the entire cartridge.

Take your faucet make and model to a plumbing supply outlet and they will identify the replacement cartridge you need. Take the old cartridge too, since you've already removed it.

They often come in packs of two, and plumbers recommend replacing both hot and cold. If one is worn out the other will surely fail soon.

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