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Thread: thread sealing... pipe or dope?

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  1. #1
    DIY Senior Member Hube's Avatar
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    Default thread sealing... pipe or dope?

    After making the connection to my house water filter, I noticed a very small leak where the 3/4" threaded plastic(mip) adaptor fitting goes into the filters' housing.
    I unscrewed it, and removed the old teflon tape and applied new tape, wrapped tightly about 3 times around the threads and re-installed it.
    Again it still has a very small leak(drip). I have turned this fitting in as tight as I dare to go so as to not damage the housing of the filter.
    Should I try installing it again with more teflon wrapping, or is there a better thread sealant than teflon.?
    Perhaps "pipe dope" is the answer.
    what would you pros suggest?
    Thanks for any reply.

  2. #2
    DIY scratch-pad engineer leejosepho's Avatar
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    I am no pro, but I believe pipe dope and plumber's putty should not be used on plastic. Take a close look at the threads on both parts, and maybe you will see some imperfection that could be tearing your tape on the way in. Or, maybe a different part would work better. With all of the various manufacturers around the world making fittings and so on, it is just not possible to believe all fittings are made to exact and precise tapers and tolerances.

  3. #3

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    They do make a teflon-based pipe dope, which is suited for plastic. I'd try wrapping it a little more with teflon tape first to see if that solves the problem.

  4. #4
    In the Trades kordts's Avatar
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    I use tape and dope. I seldom have leaks. Most dopes are safe for plastic. The labels on the cans tell you what they are combatible with.

  5. #5

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    Quote Originally Posted by kordts
    I use tape and dope.
    My experience is that you have to use one or the other, but not both. The tape seems to slide all over the place if you put it on with pipe dope. What's your technique?

  6. #6
    In the Trades kordts's Avatar
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    I buy the cheap tape on ****. I wrap 3 or 4 times then use the dope. The reason I do this is because almost all the fittings are made overseas. Now Taiwan or India means an upgrade over the chinese junk.

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