Moen Posi-temp installation

Discussion in 'Shower & Bathtub Forum & Blog' started by Rob418, May 12, 2014.

  1. Rob418

    Rob418 New Member

    Messages:
    4
    Location:
    CT
    I am installing Moen Posi-temp mixing valve in a new shower. As I look at the mixing valve assembly I am really concerned about the flow that
    the small orifice for the shower is going to provide. This is a shower only installation. Is there any problem with plugging the shower outlet and
    piping the tub fill outlet to the shower head. This is part # 2510 and im not sure what the GPM rating for the shower is, but the tub orifice looks to be twice as big.
    Thanks in advance for your thoughts. Rob

    [​IMG]
    Last edited by a moderator: May 12, 2014
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,324
    Location:
    New England
    You could use the tub port, but keep in mind, unless you modify any showerhead, they are all restricted to a maximum of 2.5gpm, and the smaller port should provide that easily.

    Some of the valves can be inverted, and to keep the hot/cold working properly, you can rotate the cartridge so it's still correct. The instructions talk about that, if it's possible.
  3. Rob418

    Rob418 New Member

    Messages:
    4
    Location:
    CT
    Jim,
    Thank you for your response. I had thought about inverting the mixer valve, and rotating the cartridge, but wasn't sure if I was violating some rule of plumbing. The directions that
    came with valve doesn't address the valve rotation. I'll call tech line today
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,263
    Location:
    Cave Creek, Arizona
    Moen valves cannot be inverted. They have a "ridge" on the stop tube that MUST be on the top, otherwise all the trim will be upside down.
  5. Terry

    Terry Administrator Staff Member

    Messages:
    15,419
    Location:
    Bothell, Washington
    Install correct side up, and if you feel you need more volume, plumb from the tub side.
    I never do.
  6. Rob418

    Rob418 New Member

    Messages:
    4
    Location:
    CT
    Oh yes I see the ridge.. ok, I will plumb with correct orientation. Thank you for the heads up!
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