Question about Moen Shower Valve 10399 extension kit

Discussion in 'Shower & Bathtub Forum & Blog' started by bang0r, Feb 6, 2014.

  1. bang0r

    bang0r New Member

    Mar 23, 2007
    San Francisco
    I'd like to seek the advice/opinion from this forum regarding the Moen extension kit (Moen posi-temp 1200) prior to rushiing out to purchase the part.

    The symptom: the master bath shower valve is very difficult to shut off completely and smoothly; one has to wiggle or nudge the knob ever so lightly to stop the drip depending on the phases of the moon; the workaround is to remove the knob and deal with the valve directly.

    The causes appears to due to the thickness of the tile work, the distance from the valve in the wall to the handle has increased; so, when the handle is pushed to the wall, the valve cannot be shut off completely. Attached are two pictures of the Moen valve.

    I was told that the Moen extension kit will provides the additional length to accommodate for the increased wall thickness.

    Is the Moen posi-temp 1200 the correct part for the repair?
    Anything heads-up to watch out for when installing the extension?

    Please advice.

    Thanks in advance.

    Attached Files:

  2. bang0r

    bang0r New Member

    Mar 23, 2007
    San Francisco
    Just want to update the forum that I have called Moen phone support, and emailed them a picture of the shower valve while still on the phone and they let me know right away the part no for the extension kit is 10399. Attached is a picture of the installation instruction. The installation is very straightforward. Thank you.

    Last edited by a moderator: Feb 21, 2014
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  4. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    It's funny you posted that. I used one of the Moen 10399 extension kits on Wednesday.
    Some of the old Moen trims, the ones with the inward dish, require the extension kit if you plan to replace with a new "flat" style trim.
    Don't forget the 1225B cartridge while you are at it.
    Last edited: Feb 21, 2014
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