Resolved: Help needed with compression fittings

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by gagecalman, Nov 13, 2019.

  1. gagecalman

    gagecalman Member

    Joined:
    Nov 25, 2016
    Location:
    Baltimore, MD
    Hi all and thanks for reading,
    I need some help with compression fittings.
    I installed a water filter for my fridge and a faucet on the sink.
    I used 1/4" copper tubing and B&K 1/4" compression fittings from Lowe's. The fittings do not have separate nuts and ferrules. They are one assembly.
    I cannot get these to stop leaking.
    I cut the copper with a good cutter.
    I just snugged the nut and anticipated a slight leak. I figured I would slowly tighten them until they stopped. They never stopped leaking.
    Please help.
    Thanks!




     

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  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Sometimes I have to cut back further and try again. Sometimes with new couplings.
    You might try some thread sealant if you have any handy. Not the tape, the pipe dope style. 1/4" OD is not my favorite stuff to couple.
     
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  4. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    If you are sure that the leak is at the copper rather than at the plastic, I suggest two longer good wrenches. Those 5 inch wrenches are too short. You could also add some pipe dope or silicone grease over the olive/ferrule to let your available torque go more toward tightening vs overcoming friction.
     
  5. dj2

    dj2 In the Trades

    Joined:
    Aug 13, 2013
    Location:
    California
    If I'm not mistaken a sleeve is needed, so I would get a sleeve (a ring to fit over the tube) and a new brass nut instead of what you got.
    Similar to compression angle stops. And yes, work with two wrenches.
     
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  6. gagecalman

    gagecalman Member

    Joined:
    Nov 25, 2016
    Location:
    Baltimore, MD
    I thought the sleeve was used on plastic tubing not copper.

    I tried two long wrenches.

    I wanted to use copper but is polyethylene tubing and quick connect fittings a better option?
     
  7. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    I hadn't considered that he might not have used the sleeve/ferrule.
    An insert[​IMG] is only used on plastic tubing, but the ferrule/sleeve/olive is always used. [​IMG]
     
    Last edited: Nov 14, 2019
  8. gagecalman

    gagecalman Member

    Joined:
    Nov 25, 2016
    Location:
    Baltimore, MD
    As I stated the fittings do not have separate nuts and ferrules. They are one assembly.
     

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  9. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Missed that. Do the ferrules wiggle, and are just captive?

    Flare nut wrenches can give more torque without rounding, as opposed to open end wrenches.
     
  10. gagecalman

    gagecalman Member

    Joined:
    Nov 25, 2016
    Location:
    Baltimore, MD
    The ferrules are loose but captive.

    I used two long wrenches but they still leak.
    The one on the angle stop (not pictured) was good until I bumped the tubing then it started to seep.
    I don't know if it's the design of these fittings.

    Any thoughts on polyethylene tubing and quick connect fittings?
     
  11. jacobsond

    jacobsond DIY Junior Member

    Joined:
    Apr 30, 2010
    Location:
    Fairmount, North Dakota
    I would try the 2 piece compression with the ferrule 1st. I have never had to much trouble with those. Not so sure about those 1 piece things.
     
  12. dj2

    dj2 In the Trades

    Joined:
    Aug 13, 2013
    Location:
    California
    gagecalman,
    I read what you installed, so if it leaks, try what I suggested before. I'm certain that you will stop the leak using a sleeve and a nut. Make sure the tube is not out of shape or damaged.
     
  13. gagecalman

    gagecalman Member

    Joined:
    Nov 25, 2016
    Location:
    Baltimore, MD
    I cut everything out.
    I bought separate nuts and ferrules and reused the original fittings.
    Using a cotton swab, I applied a very small amount of pipe dope.
    After hand tightening, I tightened them about 3/4 of a turn more.
    No leaks. I didn't have to touch them.

    This was definitely too much effort for these fittings.

    I posted this on two plumbing forums and several people replied that the nut/ferrule assemblies leak and to get the separate nut and ferrule.

    I sent an email to the manufacturer with pictures. They replied and tried to help. I’m sure they sell a lot of these but I wonder about the design.

    Thanks for the help!
     

    Attached Files:

    Reach4 likes this.
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