Newbie Installing Water Filter -- Small Leaks Driving Me Crazy!

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Richard Lowe, Jul 9, 2013.

  1. Richard Lowe

    Richard Lowe New Member

    Jul 9, 2013
    Hi all!

    New to the forum because I'm trying to tackle my first plumbing job on our house. I'm installing a Culligan water filter but can't seem to stop the connector joint from leaking.

    I'm such a newbie that I don't even know the terminology, so bear with me:

    I have a 1/2" tube going from my water supply to a brass T-joint that has a 1/2" opening and a 3/8" opening. From the 1/2" opening, a tube runs to my faucet. From the 3/8" opening, I have a 3/8" to 1/4" adapter-thing, where the tube connects and runs to the water filter.

    When I turn my water back on, a very small leak comes from the 3/8" to 1/4" adapter and I can't seem to get it to stop. I used teflon tape and made sure the nut is on tight, but still can't figure it out. (See photo, the red lines indicate the leak.)

    Any ideas? I'd love to figure it out myself without having to call a plumber, because I feel like I'm so close to being done!

    Thank you in advance!

    Attached Files:

  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    If you have a compression fitting there with a sleeve, then it won't work with Tape.

    Compression fittings, no tape
    Lav supplies with rubber cones on the large end or flat seals on the small end for sealing, no tape
    Flat rubber washer, no tape
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Tape does NOT help seal a compression connection, but it should not cause leaks either. I am not sure what kind of 3/8X1/4 adapter that is and whether you have a 'support sleeve" inside the 1/4 connection.
  5. LLigetfa

    LLigetfa DIYer, not in the trades

    Feb 6, 2011
    NW Ontario, Canada
    Ja, look for parts left over that look like this:

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