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Thread: Bathroom upgrade - shower mixing valve question -

  1. #1
    DIY Junior Member BlueBrummie's Avatar
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    Default Bathroom upgrade - shower mixing valve question -

    Hi folks,

    New to the forum and am looking for some advice/guidance about an upcoming bathroom renovation. I found a Moen shower faucet that I like but also found that the mixing valve has 3/4" inputs. I believe that this bath is serviced with 1/2" lines only (all dimensions ID). Current shower pressure is more than sufficient. Also, the new shower hardware is a shower head and handle combo, with each having a 2.5 GPM rating. So, my question is, will I be causing myself grief by putting a 1/2 to 3/4" adapter to interface to the new mixing valve? Also, I should say that I'm not likely to use both the shower head and separate handle at the same time, but I may.

    For completeness sake, let me add my home pressure is near 60 PSI at the main. and the distance from the main to the 2nd floor bath is approximately 25 ft of 1/2" feeding off a 30 ft of 3/4", slightly longer for the hot water line. The new shower hardware is the Moen TS270.

    If there's any other pertinent info you'd need to help, just let me know.

    Many thanks for your help,
    Erick
    Last edited by BlueBrummie; 01-14-2012 at 08:01 PM.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    The company often makes identical valve trim sets in both 1/2" and 3/4" rough-in versions; a 1/2" version will save you some money if it is available. No, it won't hurt performance using a reducer, and might even improve things a little as all valves have some internal flow resistance...a 3/4" one will usually have less than a 1/2" one.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member BlueBrummie's Avatar
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    Hi Jim,

    Thanks for the reply. After a bit of searching, I haven't been able to find a 1/2" version of the valve set (which is comprised of 1 temp valve and 2 volume valves for the main/handheld units). My inclination is to go ahead with my idea of adding the 1/2 to 3/4 transitions. If anyone else has thoughts/advice, I'd appreciate your input before I take the plunge and order the shower set.

    Thanks again,
    Erick

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Unless something has changed, all Moen valves use the same internal pieces so whether you use 1/2" or 3/4" would be immaterial.
    Licensed residential and commercial plumber

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