Moen Posi Temp Valve

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by winger27, May 16, 2014.

  1. winger27

    winger27 New Member

    Messages:
    18
    Location:
    Pa.
    I am installing a Moen shower/tub valve into a rough opening. I got where to install it as far as the depth goes. My question is why do I need to cut a 4 1/2" hole. The center cartridge is all that sticks out through the wall. I'm not using the temp stops and do have access from behind. If needed how do I waterproof around it? Thanks
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,992
    Location:
    Bothell, Washington
    You need a big enough hole to install the valve plate. there are two screws that are at a diangle.
    You also need space above the cartridge clip. If you don't have enough height above that, you will never be able to change a leaking cartridge. Too many times I come back after tile and some joker has tiled tightly around the stem. Then it's break out the tile bits and chip away to get some space. :(

    The part that seals, is the plate, which after installation has a bead of caulking around it. There is a little notch at the bottom of the plate. Don't fill that in. That's to prevent whatever water that may get by, a place to safely go.

    [​IMG]

    See how long the clip is? That entire clip needs to be removed.
    Last edited: May 16, 2014
  3. winger27

    winger27 New Member

    Messages:
    18
    Location:
    Pa.
    So your saying as long as there is access to the cartridge clip the hole serves no other purpose? Is the chalking around the trim plate all I need to seal so water does not get behind my tile?
  4. Terry

    Terry Administrator Staff Member

    Messages:
    14,992
    Location:
    Bothell, Washington
    [​IMG]

    The plate covers the hole. There should never be an issue with that.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,605
    Location:
    Cave Creek, Arizona
    Plates that fit entirely outside the wall do not need a large opening. Some plates recess in to the wall and opening has to be large enough to accept them.
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