Ferrule for polyethylene compression fitting

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by TipsMcStagger, Nov 30, 2012.

  1. TipsMcStagger

    TipsMcStagger New Member

    Messages:
    31
    Location:
    NYC & FL
    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: Nov 30, 2012
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,133
    Location:
    New England
    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.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    15,121
    Location:
    Bothell, Washington
    This looks good. (except for the tape on the compression fitting)

    [​IMG]
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,815
    Location:
    Cave Creek, Arizona
    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.
  5. TipsMcStagger

    TipsMcStagger New Member

    Messages:
    31
    Location:
    NYC & FL
    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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