(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 11 of 11

Thread: compression fittings

  1. #1
    DIY Junior Member dmetz's Avatar
    Join Date
    Mar 2006
    Location
    Colorado
    Posts
    27

    Default compression fittings

    I recently had to re-use the old ferrules when installing some replacement valves and had trouble getting them to re-seal, finally got them set. Is it adviseable to use eiter teflon tape and or paste over old ferrules? I have never had any problems with new ones. Does anyone use tape or paste with either new or old?? Thanks - Don

  2. #2
    In the Trades kordts's Avatar
    Join Date
    Oct 2005
    Location
    exurban Chicago
    Posts
    551

    Default

    Do not use anything on compression fittings, maybe a drop of oil.

  3. #3
    DIY Junior Member dmetz's Avatar
    Join Date
    Mar 2006
    Location
    Colorado
    Posts
    27

    Default

    Thanks, I was told to not use anything and have followed that advise but was wondering why? - Don

  4. #4
    Plumber/Owner Norcal's Avatar
    Join Date
    Mar 2006
    Location
    In the Redwoods-Northern Cal
    Posts
    91

    Default

    Quote Originally Posted by dmetz
    Thanks, I was told to not use anything and have followed that advise but was wondering why? - Don
    Same reason you shouldn't fix a leak with duct tape.

    BTW: I like to use a little plumber's grease on the threads...

  5. #5

    Default

    Because once the first connection is made to the ferrule it is like a finger print....virtually every fitting is different and the odds of getting the same old one EXACTLY in the original place at the exact same angle is very low odds so you can bet on having a leak. Sometimes you can tighten extra good to stop the leak but you may damage the nut or the fitting/valve... The ferrule is a soft metal but it still is hard to get it to seal once it is deformed by the original compression.

  6. #6
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,615

    Default ferrules

    Tell that to the hundreds, and thousands, of ferrules I have reused by just connecting the old nut to the new valve. Tighten them with a 15/16" open end wrench and you will not distort them and will not have to overtighten them.

  7. #7

    Default

    hj... me too...but the guy wants an explanation... maybe I should edit that post to be a little more liberal... I definitely would not take a ferrule off of a pipe and re-use it on another pipe. Maybe I got up too early this morning.... time to get out to work... I've got to re-key a whole house and run 250' of conduit underground for multiple phone lines.... might be a long day. Too bad I don't get intelligent and stick to just one occupation...but then I don't pass up a buck!

  8. #8
    DIY Senior Member SteveW's Avatar
    Join Date
    Feb 2005
    Location
    Omaha, NE
    Posts
    1,042

    Default

    Quote Originally Posted by dmetz
    Thanks, I was told to not use anything and have followed that advise but was wondering why? - Don

    The reason is that the seal is actually made by the ferrule mating with the spherical female part of the fixture, and NOT by the threads. Teflon tape or thick pipe dope can interfere with the ability of the nut to fully thread far enough on the male threads to adequately compress the ferrule.

  9. #9
    DIY Junior Member dmetz's Avatar
    Join Date
    Mar 2006
    Location
    Colorado
    Posts
    27

    Default

    Thanks, I appreciate all the info. - Don

  10. #10
    DIY Senior Member SteveW's Avatar
    Join Date
    Feb 2005
    Location
    Omaha, NE
    Posts
    1,042

    Default

    You're welcome! I learned that little fact, along with dozens of others, on this site - great place to check in on regularly.

  11. #11
    DIY Senior Member Mike Swearingen's Avatar
    Join Date
    Jan 2005
    Location
    On Albemarle Sound In Northeastern NC
    Posts
    621

    Default

    I'm not a pro plumber, but I've been DIYing it for more than 50 years.
    Who says that you can't use anything on a used ferrule?
    I've been smearing used ferrules with a small dab of caulk for years to seal them (with new and old nuts). Works like a charm. No leaks. No problems.
    Mike

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •