Shower Arm Diverter - Pressure issue?

Discussion in 'Shower & bathtub Forum & Blog' started by pmetiv, Aug 9, 2009.

  1. pmetiv

    pmetiv New Member

    Messages:
    6
    Location:
    New York, NY
    I want to install a diverter at the shower arm to use a handshower.

    I have been looking for a while and found brands like Hansgrohe and Danze who sell them for $30 to $50 :(. While at HD today I saw a Danco for $15 :).

    When looking at it closer, only a small water access is open...probably 3/4 of the 1/2in opening is blocked :confused:.

    Won't this kill the water pressure? Are the other brands like that too? Unfortunately this is the only brand I can find in a store and would have to order the other brands online...want to know if someone owns a brand with a full 1/2in opening. Is the big price only because of the brand or do they let more water out?!

    (Hope this makes sense...I should have taken a picture!!)

    Thanks for your help.

    Pierre
    Last edited: Aug 9, 2009
  2. TedL

    TedL New Member

    Messages:
    604
    Location:
    NY Capital District
    Welcome to the world of federal law/regulation. The shower must not pass more than 2.2 gpm at 80 psi (IIRC). To ensure they meet the standard, flow is restricted as you have observed. Many products use a removable washer to limit the flow in the US, but allow for easy removal outside the US. Some US residents even take advantage of this to readily break the law. Other flagrant lawbreakers have been known to drill out these restricted orifices.
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,896
    Location:
    New England
    It takes a bit of engineering to take that restricted flow and make the shower head produce a pleasing result. Removing the restrictor in them may turn them into a fire hose, but, you'll quickly run out of hot water, too. Not always, but you tend to get what you pay for...
  4. pmetiv

    pmetiv New Member

    Messages:
    6
    Location:
    New York, NY
    I understand the regulation and already have it on my showerhead and handshower. But why does it need to be on the diverter too?! So far I only saw the Danco but this is molded in brass. There's no way to remove it like you would with a plastic piece. I guess I need to test it but wouldn't the flow be even worst now that the diverter is also restricted on top of the showerhead?

    Thanks for your help.

    Pierre
    Last edited: Aug 9, 2009
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,488
    Location:
    Cave Creek, Arizona
    diverter

    If the flow is restricted to the proper amount at the diverter, then the head's restrictor would allow the full flow since there would not be any excess for it to control.
  6. pmetiv

    pmetiv New Member

    Messages:
    6
    Location:
    New York, NY
    Makes sense. I guess I need to test it now.

    Thanks!
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