I bought these replacement faucet cartridges from Revain after not being able to find them at two different major hardware stores (national and local chains). I hesitated to buy as they didn't list part numbers. However, the measurements were accurately described and worked well to replace the old faucet cartridges (PAINI ASME A112181UPC, ANSI NSFON90) pictured above. My faucet handles didn't have screws to unscrew, but it was easy to work with a flathead screwdriver (wrapped in a small towel) and loosen the handles.
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