shower head dribling

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by J carr, Nov 22, 2008.

  1. J carr

    J carr New Member

    I just put in a new moen shower with temp control and when I go to fill the tub with water the shower dribils water out how do i fix that?
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    New England
    You might not be able to without repiping. What type of pipe do you have to the tub spout and what do you have going up to the showerhead?

    There's a prescribed distance and pipe to the spout. If you used pex, or some other plastic pipe and not copper, or if it is too long, or if you used the wrong ports, you can get too much restriction and it will back up into the showerhead.
  3. Redwood

    Redwood Master Plumber

    You will note on the upper right side of page 2 there are specific requirements for the spout connection.

    It must be 6" to 12" lower than the mixer valve and must be 1/2" copper or IPS sized pipe only. If PEX or CPVC is used the showerhead will dribble.

    Moen Instruction Sheet
  4. leejosepho

    leejosepho DIY scratch-pad engineer

    Not mine! But yes, and since I was working with a used tub that already had holes in wrong places, I did have to do a little extra work to get the minimum length necessary.

    Attached Files:

  5. WoW ???!!!!!!!!

    You've got that valve upside down, using the shower for the tub spout, the tub spout port for the shower.

    Hot is cold and cold is "may" of been able to switch index buttons but I'm thinking the valves open 180 opposite of their normal on/off patterns.

    That blocking would have me using C-4 explosives behind that wall.

    Anyone accidentally hits that tub spout a few years from now, it's going to shear right off because CPVC is very brittle as it ages.
    Last edited by a moderator: Nov 24, 2008
  6. leejosepho

    leejosepho DIY scratch-pad engineer

    Yes, I thought you might enjoy commenting on it!

    The directions specifically said the valve could be used either way by re-positioning an internal part, and the valves are both still "righty-tighty" (off) and "lefty-loosey" (open) with hot on the left and cold on the right.

    Yes, and that would be about the only way to ever damage it!

    Yes, that is a problem I did not know about at the time and will need fixing if that ever happens. However, there is a sump in the floor just a couple of feet from there, so the broken PVC will be the only damage.
  7. jimbo

    jimbo Plumber

    San Diego
    Unfortunately, you really screwed the pooch on this one! Even if the valve is not upside down, which we think it is, the 6" to 12" spec to the spout means vertical distance, not just adding pipe and elbows. That u-bend compunds the issue you already have with the CPVC pipe, which violates the manufacturer's install spec.
  8. hj

    hj Moderator & Master Plumber Staff Member

    Cave Creek, Arizona

    those valves were inverted all the time when the supply came from overhead. The restrictor had to be relocated on two valve, non twin ell, versions, but that was a minor thing. The biggest question is "HOW did you get the spout attached" given that the bottom section is not parallel to the wall. And if you had room to make the double 90 offset, you should have been able to drop straight down.
  9. Redwood

    Redwood Master Plumber

    Lee your plumbing has an amazing ability to function somewhat no matter how badly you install it.

    Im the case of your shower I can only assume that your well system is functioning at an extreemely low volume and pressure. Surely if you had a 1/2 decent water supply the water would come out of both. There is no doubt in my mind!

    Maybe plumbing advice is not your strong suit...
  10. leejosepho

    leejosepho DIY scratch-pad engineer

    Just out-of-sight in the picture, the pipe turns up and straight forward toward the spout.

    Sure, but the tub was a used one with holes already in wrong places. I would have liked to raise things up, and I did not want double handles. But, I had to make do with what I had ... and the shower does not drip while the spout is running ... and I have not given anyone any advice at all, Redwood.

    Well, just come see for yourself anytime you might wish. Our water pressure runs between 35 and 55 psi, and the spout never emits even one drop while the shower is running through however many pump cycles it takes for me to enjoy a nice and long hot spray.
    Last edited: Nov 23, 2008
  11. Obama the Plumber

    Obama the Plumber Plumber

    Washington DC
    J Carr,
    You may have installed your "Moen" valve upside down.
    The Moen is drilled to have a smaller opening for the shower side, allowing most of the water to go to the tub spout.
    If it's upside down, then it will allow water to run up to the shower head.

    On Lee's project, since he knew about the part that could be internally turned over, I think he should be okay.
    It's still fun to look at though.

  12. WHAT THE E?

    Well, if it works, it works. I give you internet cred for putting the picture up so everyone could see.

    I don't think it'll ever come loose though...
  13. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Chicago, IL
    I am shocked they still sell two handled tub and shower valves. In Illinois you have to put in a single handle valve or if the home owner really has their heart set on a two handle set up you need to install an easily accessible thermal mixing valve to prevent scalding.
  14. Redwood

    Redwood Master Plumber

    That installation is truly amazing...
    Why don't you enter it in Marks Pig Slop Plumbing Contest...
    Perhaps some good will come from it!
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