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    FBSFK's Avatar
    FBSFK Posts: 3, Reputation: 1
    New Member
     
    #1

    Dec 13, 2007, 10:13 AM
    Loose Ander Lign compression fitting
    I've been trying to use an Ander Lign compression fitting to connect a 3/8" OD plastic tube to an Ander Lign tee. I tighten the nut very tight, but the tube can still be pulled out of the fitting fairly easily. I've followed the installation instructions exactly. What I've noticed is that the brass insert (which came in the package with the fitting) is only about 0.17" OD while the plastic tube is 0.25" ID. Any comparable experiences out there? Is the solution just to use the next size larger OD insert so that the ferrule has something to squeeze against?
    doug238's Avatar
    doug238 Posts: 1,560, Reputation: 62
    Ultra Member
     
    #2

    Dec 14, 2007, 07:43 PM
    Maybe you got the wrong fittings?
    FBSFK's Avatar
    FBSFK Posts: 3, Reputation: 1
    New Member
     
    #3

    Dec 15, 2007, 01:06 PM
    Nope, it was the correct fitting, 3/8" size, which comes in a sealed plastic bag with all components.
    doug238's Avatar
    doug238 Posts: 1,560, Reputation: 62
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    #4

    Dec 17, 2007, 12:13 AM
    Maybe you got defective fittings
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #5

    Dec 17, 2007, 09:19 AM
    "about 0.17" OD while the plastic tube is 0.25" what is the ID of the ring and the OD of the tube? They need to match.
    FBSFK's Avatar
    FBSFK Posts: 3, Reputation: 1
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    #6

    Dec 17, 2007, 07:58 PM
    The tube is 3/8" OD x 1/4" ID. The ring (ferrule) is 3/8" ID and fits smoothly and snugly on the tube. In other words, the ring and tube match properly. No, the fittings are not defective in terms of manufacture, as all components are the same sizes in several packages.
    In view of no one addressing my suspicion that the insert is undersized for the tube (i.e., 0.17" OD with a 0.25" ID tube), am I to assume that you agree that this differential suggests a design defect?
    Thanks a lot.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
     
    #7

    Dec 17, 2007, 08:56 PM
    In order for compression fitting to work on plastic tubing, you need to use a tubing insert.

    http://www.arrow-ind.com/pdf/Compression_flare.pdf

    And I'd also use a Delrin sleave.
    rjohnston79's Avatar
    rjohnston79 Posts: 1, Reputation: 1
    New Member
     
    #8

    Oct 22, 2010, 03:51 PM
    I have had the same problem with Ander Lign fittings - they must be incredibly tight before the can hold even the slightest pressure...

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