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Thread: Check Valve for handheld shower

  1. #1
    DIY Junior Member IAmLulu's Avatar
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    Default Check Valve for handheld shower

    We're doing a DIY bathroom remodel. We will be installing a Sterling tub/shower and surround. We plan to have only one shower head, which will be a Grohe Handheld Shower. We are putting in a Hansgrohe Wall (water) Outlet, a Mount for the handheld shower, a hose, of course, but not a bar. The Diverter will be on the tub water Spout. Some Wall Outlets come with a Check Valve...I'm thinking I don't need a check valve, because we will have a Diverter...Am I correct, or do I need to get a wall outlet with a check valve?
    Thank you for any advice you have to offer...

  2. #2
    DIY Senior Member Smooky's Avatar
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    Do you mean a vacuum breaker instead of check valve?

    Some municipalities require that a fixture have an air gap or a proper anti-siphon vacuum breaker. If the hose hangs below the rim of the tub then it might be required.
    Last edited by Smooky; 11-21-2013 at 05:45 PM.

  3. #3
    DIY Junior Member IAmLulu's Avatar
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    Smooky, In the description of the Hansgrohe Wall Outlet with dual Check Valve, it says "Double check valve to protect against backflow".
    Last edited by Terry; 11-25-2013 at 09:21 AM.

  4. #4
    DIY Senior Member Smooky's Avatar
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    My though is that since the back flow preventer is in the wall outlet, it is to prevent tub water from back siphoning into the potable water in case of a loss of water pressure and the sprayer is in a tub full of water. If someone turns on the sink downstairs, water could be siphoned into the system. Most codes do require either an air gap or a proper back-flow preventer. However there are many shower hoses installed that do not have an air gap or a proper vacuum breaker, especially in private homes.


    http://www.hansgrohe-usa.com/article...-27458003.html

    http://www.hansgrohe-usa.com/article...-27454002.html

    Hansgrohe also makes a vacuum breaker that can be installed where the hose is attached if it is needed and not built in to the unit .

    http://www.hansgrohe-usa.com/article...-06510000.html
    Last edited by Terry; 11-25-2013 at 09:24 AM.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    The length of the hose will determine whether you need a backflow, or air gap, on the shower outlet. If it can hang below the tub's
    overflow opening, then you would need one.
    Licensed residential and commercial plumber

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