Compression Fitting

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Bertman48, Feb 13, 2006.

  1. Bertman48

    Bertman48 New Member

    Feb 10, 2006
    I read an article that recommended putting pipe joint compound all over the ferrule when installing a compression shut-off valve. Is that a good recommendation?

    Also, does the supply line copper tubing have to be inserted all of the way into the shut-off valve or can it be partially inserted?

  2. Bob NH

    Bob NH In the Trades

    Oct 20, 2005
    New Hampshire
    The copper tubing should be inserted all the way to ensure proper mechanical alignment and resistance against bending. Otherwise, it can bend and the ferrule won't always seal properly and permanently.

    The pipe dope contans a little oil that will cut down the friction between the nut and the ferrule. It usually isn't going to hurt if you don't get carried away. On the other hand, it is not a magic potion to fix a misaligned or overtorqued fitting.
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  4. plumber1

    plumber1 Plumber

    Aug 7, 2005
    If you want to use something, a little grease could help........
  5. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    Plumbers grease, a little 3-in-one oil, or some dope are all good to prevent future galling. I do like to use teflon paste. I would no use some of the "stiffer" non-teflon pastes, as some of then actually take a set over time.
  6. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Sleeve puller

    At the most, I use a light spray oil on the threads.
    Most of the time, I don't even do that.

    I replace compression stops all the time.
    Some use more than that, but I never have.

    Compression fittings work well.
    They are one of the fastest methods around, and they still allow for replacement with a sleeve puller, which I have in the tool box.
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