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-   -   Ask this Old House episode using pipe dope on compression fittings (https://www.askmehelpdesk.com/showthread.php?t=501182)

  • Aug 23, 2010, 07:54 PM
    KISS
    Ask this Old House episode using pipe dope on compression fittings
    This episode aired this past weekend where they updated a kitchen with a dishwasher, custom counter top with built-in sink, dishwasher and stove.

    One thing they did was used pipe dope on the sealing surface of compression fittings.

    What's your opinion on this?

    And one no no: It looked like they used a BX connector rather than a NM-B connector for the range hood.
  • Aug 23, 2010, 10:20 PM
    Scleros

    I saw that too and questioned it. Seems like it would defeat the principle of a compression fitting. Might have some merit if the original fitting was being reinstalled after being taken apart which is what may have been the situation with that dishwasher. I have also heard of applying teflon or oil lubricant on installation to assist with getting a fitting apart later if need be; perhaps that was the intent. Write 'em a questioning letter, maybe you'll get a t-shirt.
  • Aug 23, 2010, 10:57 PM
    KISS

    I will use plumber's grease.

    Compression is a funky fitting anyway. In industry I was using Swagelok with a pre swaging tool. Loved the fittings.
  • Aug 24, 2010, 06:31 AM
    speedball1

    Quote:

    One thing they did was used pipe dope on the sealing surface of compression fittings.

    What's your opinion on this?
    After the compression nut split on a angle stop and flooded a condo unit to the tune of $27,000.00 the manufacture, Brass Craft, sentb us a letter telling us that they would not honor the warranty if the ferules were coated with pipe dope. Seems the pipe compound swelled and cracked the compression nut.
    Regards, Tom
  • Aug 24, 2010, 06:33 AM
    KISS

    That's a really good reason not to do it. Thanks, Tom.

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