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Thread: Moen shower faucet attachment - confusion!

  1. #1

    Default Moen shower faucet attachment - confusion!

    I'm almost finished tiling my new shower, now its time to attach the faucet.

    I have a new moen shower setup listed here:
    http://www.moen.com/browsecatalog/ca...ct&sku=82248BN

    According to the instructions I should be able to do a "slip fit" or IPS connnection for the spout. I would like to do slip fit, I currently have a brass pex drop ear in the wall waiting for me to attach pipe to it.

    The very vague instructions show a set screw attachment which is all well and good, but there is no place to put a screw at all. Just a U shaped cut out on the bottom of the spout, with nothing behind it. There is of course a threaded portion at the opposite end of the spout for IPS. Do I need a different spout all together? There seems to be nothing on the package to indicate a seperate IPS or Slipfit version. I thought I could do either with this kit. Thanks in advance for setting a newbie like me straight.

  2. #2
    Master Plumber Redwood's Avatar
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    Quote Originally Posted by loFreqncy View Post
    According to the instructions I should be able to do a "slip fit" or IPS connnection for the spout. I would like to do slip fit, I currently have a brass pex drop ear in the wall waiting for me to attach pipe to it.
    I'm sorry to hear about that! When you finish your job water will come out of both the spout and the shower at the same time. Pex is not supposed to be used in that application.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    They have different part numbers for the slip-fit verses the IPS version of the spout...so, it appears they are not dual-purpose. Sounds like you got the 3806 spout verses the 3807. Probably a different dash-number on the box.
    Jim DeBruycker
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    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4

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    Quote Originally Posted by Redwood View Post
    I'm sorry to hear about that! When you finish your job water will come out of both the spout and the shower at the same time. Pex is not supposed to be used in that application.
    So far so good as far as I can tell, I've had the drop ear plugged and used the shower serveral times. Why would Pex make water come from both? Is it a back pressure issue. I'd really like to understand why this would be? To be clear, the drop ear is PEX(already connected in wall) to 1/2" ips.
    Last edited by loFreqncy; 08-01-2008 at 10:21 AM.

  5. #5

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    Quote Originally Posted by jadnashua View Post
    They have different part numbers for the slip-fit verses the IPS version of the spout...so, it appears they are not dual-purpose. Sounds like you got the 3806 spout verses the 3807. Probably a different dash-number on the box.

    Darn, looks like IPS it is, I don't want to waste any cash on this. Any tips on getting the ips pipe the perfect length? It says it should be 4 1/16" from the finished wall surface.

    Thanks again.

  6. #6
    Master Plumber Redwood's Avatar
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    Wait until you try to use the spout to fill the tub!

    Due to the backpressure from using PEX it will come out of both the tub spout and the shower at the same time.
    Last edited by Redwood; 08-01-2008 at 11:46 AM.

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    Master Plumber Redwood's Avatar
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    You will notice on the linked installation instructions for your valve on the top right side of page 2 in the Tub Shower dimensions drawing there is a small but very important note "Use 1/2 Copper or IPS Pipe Only." This is the very reason for that note.http://www.moen.com/shared/pdf/instr...ts/INS151F.pdf

  8. #8
    Retired Defense Industry Engineer jadnashua's Avatar
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    The OD of pex and copper is the same, but the ID of pex is smaller, thus less volume and potentially more backpressure. Depends on your water pressure whether you'll see a problem. Pex to the valve would have been fine, but everything after the valve should be copper.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  9. #9

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    I did a test run, and it has a small trickle. still very usable, guess I'll have to live with it. If it really bothers me later on, I'll have to cap it off and tile over the spout. Thanks for the heads up. In the future I'll know better. Live and learn, I guess.

  10. #10
    DIY Member B2CHR's Avatar
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    To me the inside of the pex seems to work fine but it's the very small dia of the 90 brass pex fitting that causes the restriction. I run pex up to the showerhead and this works fine to me.

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    Master Plumber Redwood's Avatar
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    Pex up to the showerhead is not a problem. Wnen you run it down to the spout the the small dia. of the adapter at the valve, tubing and drop ear 90, creates too much back pressure and pushes water up to the shower arm.

  12. #12

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    Quote Originally Posted by Redwood View Post
    Wait until you try to use the spout to fill the tub!

    Due to the backpressure from using PEX it will come out of both the tub spout and the shower at the same time.
    I am very happy to report that I encountered none of the above problems, works flawlessly. When I fill the tub, about 2 drops come out of the shower head at first, and thats it. You had me pretty worried!

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    Master Plumber Redwood's Avatar
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    Phew, You're a lucky one!

    If it happens at some time in the future it would probably be due to the water company increasing the pressure.
    In that case a Pressure Reducing Valve could be installed reducing the pressure to where it is now...

  14. #14
    Moderator & Master Plumber hj's Avatar
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    quote; I am very happy to report that I encountered none of the above problems, works flawlessly. When I fill the tub, about 2 drops come out of the shower head at first, and thats it.

    I guess there really is a Supreme Being who watches over people who do not read, or follow, the written directions.

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