Why is this plumbed this way? Grohe twin ell

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by sokolq55, Jan 31, 2021.

  1. sokolq55

    sokolq55 Member

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    Dec 12, 2020
    Location:
    Western NY
    I’ve seen some shower/tub plumbing where the tub faucet line is routed in a U (sort like a p trap) from the valve to the tub stub out. Why is this done that way in some cases?

    81646C7C-0A41-478A-B043-9DBB6785DF21.jpeg
     
  2. Reach4

    Reach4 Well-Known Member

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    No functional reason that I can think of as you drew it.

    Edit: On the other hand, the twin-ell has a great functional reason.
     
    Last edited: Jan 31, 2021
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  4. Terry

    Terry Administrator Staff Member

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    [​IMG]

    perhaps the Grohe Twin Ell is what you're thinking of?
    It makes sure that when the tub is run that water isn't forced up to the shower head with the diverter tub spout.

    • Required for Shower/Tub Combinations with Diverter Spout (EXCLUDING GrohSafe™ Rough-In Valves)
    [​IMG]
     
    Last edited: Jan 31, 2021
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  5. sokolq55

    sokolq55 Member

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    That’s what I was thinking. This is the way i saw it installed with a thermostatic valve with an integrated three-way diverted in the valve so I didn’t think the double ell applied in that case.
     
  6. Jeff H Young

    Jeff H Young In the Trades

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    some valves require twin ell been awhile since i did one other wise it wont function proper if has one dont remove it
     
  7. sokolq55

    sokolq55 Member

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    Western NY
    Hi Terry,

    This was in fact about a Grohe product, but there is no twin ell as this was not for a diverter spout. I've posted this picture before. I've circled what I'm referring to. This picture is from an official Grohe product show, so I assumed maybe there was a specific reason for this being plumbed that way. But I do not see anything in any of their installation instructions about that. It might just not mean anything - someone had some extra elbows to use up, lol.

    Screen Shot 2021-02-01 at 10.31.21 AM.jpg
     
  8. Jeff H Young

    Jeff H Young In the Trades

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    German Engineers getting kickback from Nibco for pushing waste of copper fittings?
     
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  9. Reach4

    Reach4 Well-Known Member

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    Location:
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    That might make the spout on the display better able to mechanically overcome a downward bending of the spout.

    It could also be that the Feng Shui expert thought it had better water feature characteristics.
     
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  10. sokolq55

    sokolq55 Member

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    :D:D:D
     
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