Installing a "bottle trap" drain in an older house

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by boy412, Sep 30, 2012.

  1. boy412

    boy412 New Member

    Sep 30, 2012
    Washington, DC
    So we are tearing apart a small powder room in a 1950's home...and have hit a bit of a snag with the existing plumbing. We want to install a bottle trap drain with the new sink, since the plumbing will be exposed and we think these drains look cool. Something like this:


    The problem is the drain stub coming out of the wall is 2" threaded iron. The drain we like (above) looks to have a 1 1/4" outlet. So I'm wondering what options I have? I'd hate to remove the existing stub, since it would require cutting into a healthy plaster wall. Any ideas?

  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    For a trap like that, you need a 1-1/4" thread at the wall. The nut barely clears the wall, and then the escutcheon covers that.

    It's time to open the wall if you want exposed plumbing that looks nice. Anytime somebody asks me about exposed plumbing, it's time to think about redoing the pipes in the wall to make sure they look good on the outside.

    The bottle trap, since it has no swivel, has to be dead on centered with the lav drain.
    Last edited: Sep 30, 2012
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  4. Tom Sawyer

    Tom Sawyer In the Trades

    Nov 29, 2010
    Bottle traps can be a bear to get lined up and besides that, in most places they are illegal
  5. boy412

    boy412 New Member

    Sep 30, 2012
    Washington, DC
    Illegal? Wow. I'll need to check code in my area. Thanks for the heads up guys!
  6. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego
    Despite general assumptions.....bottle traps ARE approved by the UPC.....with the proviso that the internal weir( separator) be made of material which will not corrode away....meaning plastic. you will probably find a CSA or UPC mark on the trap. Without that marking of course it is NOT allowed to be used.
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