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Thread: What makes compression fittings leak?

  1. #16
    DIY Senior Member guy48065's Avatar
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    Well then I AM doing it wrong. I always thought ferrules were supposed to be crimped on so they can never move. Permanent. If I had to estimate the torque I typically use I would say maybe 10 foot-pounds on a 3/8 line.
    Romeo and Atlanta, MI

  2. #17
    Jack of all trades DonL's Avatar
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    Normally the ferrule will bite into the tubing, and if the connector needs replaced, you need a new ferrule and need to cut back to a new place on the tubing.

    The copper does get pinched, and the ferrule will not move on the tubing, after you tighten it then take it apart.


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  3. #18
    Retired Defense Industry Engineer jadnashua's Avatar
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    The fitting doesn't need to be so tight it deforms the pipe to seal. You can make it tight enough to deform the pipe, and if you do, would need a puller (or cut it off) to remove it. Since that isn't uncommon is one reason why the tool exists. I haven't taken that many apart, but on those that I have, they weren't leaking, and I was able to pull the ferrule off without needing a tool. All that's required is intimate contact, not a depression or crimp effect.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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