I can't find this plumbing fitting anywhere!

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by joe28_bak, Aug 7, 2012.

  1. joe28_bak

    joe28_bak New Member

    Messages:
    3
    Location:
    Buffalo, NY
    I hope someone can help. I have a standard drinking water filter faucet, which mounts to the sink deck with a threaded stud through which the water flows. This stud seems to have a 1/4" compression fitting thread, but you can't attach a copper tube directly with a compression fitting, as the center of the brass stud has a plastic sleeve inside that would prevent you from inserting copper tubing, and also prevent ferrule from seating correctly. These faucets come with a small adapter that screws onto the compression thread and butts up against the end of the stud, sealing with a flat rubber or plastic washer (rather than a compression seal). The other end of the fitting is a standard 3/8" compression fitting that would accept copper tubing (or a faucet supply line, for that matter.) Anyway, I need to replace that adapter fitting. Last time, I was forced to buy a whole new faucet just to get the tiny brass adapter. My thinking is that if one of these fitting comes with every darned drinking water faucet, I should be able to buy them separately. I've tried everyone from the well-equipped hardware store to Home Despot to Google searches, but I can't find the part!
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    The mounting stud may be 1/8" NPS ( straight) pipe thread, hence the need for that adapter which is fairly readily available at a good plumbing supply.
  3. joe28_bak

    joe28_bak New Member

    Messages:
    3
    Location:
    Buffalo, NY
    It would make sense if it was 1/8" NPS, but it isn't. 1/8" NPS threads are too small, and flare fitting threads are too big. It has to be 1/4" compression threads.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,247
    Location:
    Cave Creek, Arizona
    I haave never seen that piece individually. I guess their thinking is that every faucet needs ONE and that is the one they send with it.
  5. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    1/8" IP is 0.405" OD, slightly larger than a 1/4" male compression fitting
  6. joe28_bak

    joe28_bak New Member

    Messages:
    3
    Location:
    Buffalo, NY
    Oh well. I guess there will be two or three drinking faucets without the fitting on e-bay. In the meantime, if anyone finds a source, let me know.
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