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Thread: Test Shower Arm?

  1. #1
    DIY Junior Member GoDillos's Avatar
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    Default Test Shower Arm?

    I'm curious about how you go about testing the shower arm branch (??) before you seal up the wall. By that, I mean the pipe that goes from the shower valve to the shower head. It seems that there's no way to test without actually installing the valve in the rough in, and then removing it before you put up the wall. I'm I missing something, or is that the best way to do it?

    Thanks

  2. #2
    Master Plumber-Gas Fitter shacko's Avatar
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    Default Testing Shower

    The shower valve SHOULD be installed before the wall. Make sure you rough it in correctly or you may have to tear it out after the wall is up, luck.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    You probably don't want to leave the shower arm on while tiling, but you can install it, put a cap on the end, then turn on the water to check for leaks. If you install the tape and/or pipe dope properly, and get it tight, it should not leak.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default test

    You install the valve, without the trim or handles, screw a pipe nipple with a cap into the shower connection, and then open the valve. it is not rocket science.

  5. #5
    DIY Junior Member GoDillos's Avatar
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    Default

    Thanks for help, and sorry for the confusion. I'm installing a Hansgrohe Thermobalance I where the valve is actually part of the trim and is not supposed to be installed before the wall is finished. I *thought* the "rough-in" was just a hollow piece of brass and if I turned the water on there would be nothing to stop the water from rushing out the face of the rough. It turns out the rough comes pre-installed with a flushing plug that directs the water to the shower arm for the express purpose of testing.

  6. #6
    Forum Admin, Expert Plumber Terry's Avatar
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    Default

    It turns out the rough comes pre-installed with a flushing plug that directs the water to the shower arm for the express purpose of testing.
    I have only worked with a few Hans Grohe,
    Yes, they have their quirks.

    Delta now comes without the "guts" and supplies the cartridge with the trim.

    The bad thing about that is, say you have someone living in the home, and they have remodeled "one" bathroom.

    By capping the shower head and tub spout, and leaving the rough-in plug in place, the hot can cross over.
    When this happens, you may have lukewarm water for the other parts of the house.

  7. #7
    In the Trades EuroPlumber's Avatar
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    Default Cross flow

    Your right on Terry, if the home is occupied, then you need to test, then install the cartridge from the trim set. You will need to buy the trim early in these cases.

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