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Thread: Putty for AC lines

  1. #1
    DIY Senior Member SteveW's Avatar
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    Default Putty for AC lines

    Just wondering - what do the HVAC folks use to caulk around the refrigerant lines where they enter the house? The stuff they use here in the midwest feels a lot like plumber's putty - never hardens, and you can kind of smoosh it around if part of the hole in the siding is exposed.

    In my situation, it has pulled away too much to put back into place, and I'd like to add some more. I haven't seen any non-hardening caulk or putty at the store, other than plumber's putty -- should I use that?

    Thanks.

    Steve
    Omaha, NE

  2. #2
    DIY Member George R's Avatar
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    Default

    No, don't use plumbers putty. I don't know what you call what you are describing, but it is available in most big box stores. It comes as a 1"x2"x6" grey colored "brick" wrapped in heavy clear poly. I think you may find it in the electrical dept. as it's used to seal electrical conduit penetrations as well.
    Last edited by George R; 10-01-2006 at 10:34 PM.

  3. #3
    Plumber Cass's Avatar
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    Default

    In the trade it is known as thumb gum.

  4. #4
    DIY Senior Member SteveW's Avatar
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    Default

    Thanks, gentlemen - I'll look around the electrical dept. -

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