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potholes_n_snow t1_iwcjynh wrote

The easiest way in my opinion would be to locate a new identical valve, and swap the movable parts - unless something is wrong with the body of the valve. The plastic piece you mention is a sleeve used for Pex connections, but is mostly used by plumbers and is quite permanent. You can always cut the plastic tubing below it, but then you have other problems to solve... If that connection doesn't leak, I'd leave it alone, and swap the inside of the valve with new parts.

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Parley_Pratts_Kin OP t1_iwckfym wrote

Thanks. That might be my best bet, especially since I don’t have a tool to crimp a Pex connection. I’ll see if I can swap the movable parts.

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TheFishBanjo t1_iwdbl2p wrote

This. Sometimes you can find a manufacturer or model on the valve by using your smartphone camera. Try several angles. Take those pictures with you to the stores.

Pex is relatively new so you have a good chance to find that valve still being sold.

Clean the valve seat (in the valve body) gently when you are reassembling. A small amount of faucet grease on the seal is a good idea but not required.

BTW: to avoid breaking a valve, when you start to turn, if it resists; turn just a little CCW, then back CW to tight, then back CCW a little more... Back and forth can break the corrosion up without breaking the stem. It usually works.

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