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Thread: Ferrule for polyethylene compression fitting

  1. #1
    DIY Member TipsMcStagger's Avatar
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    Default Ferrule for polyethylene compression fitting

    I have a 1/4" polyethylene line running to my fridge to supply the ice maker. It's routed behind some molding, so I need to stick with polyethylene. The polyethylene was connected to a push-in type plastic connector that cracked, resulting in a leak. The plastic push-in connecter had a union that was screwed into a standard stainless ice-maker line with an o-ring fitting.

    I want to eliminate the plastic fitting to preclude any future failure as a result of cracking, so I purchased a 1/4" brass compression fitting and the brass insert for to prevent the polyethylene line from crushing.

    My concern is with regard to the ferrule. The brass compression fitting has an integrated brass ferrule. Is this acceptable for polyethylene line or do I need to buy a brass fitting without an integrated ferrule and use a Derlin ferrule for the polyethylene?

    The polyethylene did blow-out of the compression fitting the first time I turned the water back on but I assume I just hadn't tightened it down sufficiently or seated it properly. It's back together and not leaking but I'm concerned about longevity.

    Thanks.

    Tipsy

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    Last edited by TipsMcStagger; 11-30-2012 at 11:20 AM.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    First, don't use tape on compression fittings!

    As long as the OD of the ferrule is correct for the tubing in use, it should work. Same with any compression fitting, it must be tight enough to hold, but not so tight that it deforms the tubing excessively...there's a happy medium in there that will work and be reliable.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
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    This looks good. (except for the tape on the compression fitting)


  4. #4
    Moderator & Master Plumber hj's Avatar
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    The "captive" ferrule is called an "all material" one so it is for use on PE tubing also. The original one cracked because someone violated the rule that you do NOT screw a metal fitting into ta female plastic adapter. Doing that will almost ALWAYS cause a cracked fitting.
    Licensed residential and commercial plumber

  5. #5
    DIY Member TipsMcStagger's Avatar
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    Quote Originally Posted by hj View Post
    The "captive" ferrule is called an "all material" one so it is for use on PE tubing also. The original one cracked because someone violated the rule that you do NOT screw a metal fitting into ta female plastic adapter. Doing that will almost ALWAYS cause a cracked fitting.
    Didn't know that about the ferrule. Thanks. It seems to be holding well.

    With regard to the plastic cracking, it lasted ten years, so not bad I guess

    Tipsy

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