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

  1. #1
    DIY Junior Member Richard Lowe's Avatar
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    Jul 2013

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

    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!
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  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Aug 2004
    Bothell, Washington
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    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

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 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.
    Licensed residential and commercial plumber

  4. #4
    DIYer, not in the trades LLigetfa's Avatar
    Join Date
    Feb 2011
    NW Ontario, Canada


    Quote Originally Posted by hj View Post
    ... and whether you have a 'support sleeve" inside the 1/4 connection.
    Ja, look for parts left over that look like this:

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