I have a very nice faucet that needs new cartridges but have been unable to find the manufacture of this unit to source out the correct replacement.
Does anyone here know how may have made this and where I might source these replacements?
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I don't know the manufacturer. =It is my experience that one can take the all parts to a nearby plumbing supply store (as opposed to Home Depot or Lowes etc...) and the counter people will be able to identify it and provide parts.
There is also an online stem finder tool with an option for unknown manufacturer:
Another approach I used successfully is to take a couple of photos from various angles of the cartirdge and of the set, then use google image search to find similar photos online. Scan through the results to find true matches. They may have been posted by a plumbing supply house or by a DIY blogger fixing theirs. Lastly if it is just the o-ring, replace the oring as a generic item.