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Thread: Gem cap

  1. #1
    IBEW Electrician big2bird's Avatar
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    Sep 2012
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    Anaheim, Ca.
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    Default Gem cap

    I demolished my old kitchen today. Since my new one is in a new location, I tore out the old cast iron oakum stuff , cut the last of the 2" close to the 4" main I am reusing, and installed a gem cap. Is that kosher?
    BTW, that old 2" C.I line looked like a 3/4" pipe inside. No wonder I had issues for years.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Cave Creek, Arizona
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    Default

    If I read your description properly, you used what we call a "dollar plug". Our "gem caps" are a rubber cap which goes over the pipe and secures with a hose clamp. If you DID use a gem cap, then I would not trust any rubber cap inside a wall. They do deteriorate, which is why we have to scrap our old ones periodically.
    Licensed residential and commercial plumber

  3. #3
    IBEW Electrician big2bird's Avatar
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    Sep 2012
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    Anaheim, Ca.
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    Default

    It is indeed a rubber Gem cap. But it is in the crawl space, on a 2" branch, about 5' from the main 4" run the length of the house.

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