Disposer, need two traps. How?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Henry, Jun 25, 2006.

  1. Henry

    Henry New Member

    Joined:
    Jun 25, 2006
    My disposer's manual says use two traps. Most people say do not. My inspector says use two. How do I use two P-traps (we can't use S-traps here)?

    Do I need two drain lines behind the wall, and each P-trap comes out of the wall behind each sink?

    Can I put a tee between the two traps and direct the common (middle) leg to a single drain line? Would a baffle tee work in this orientation, or does it have to point downward?

    Anybody got a diagram of a good two-trap configuration?

    H. C.
     
  2. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    traps

    There may be as many "good" two trap designs as there are sinks. There is no "one design fits all", and each installation has to be individually configured. You might need a Y, a double Y, Y and 1/8 bend, etc. You have to design it to fit your sink configuration and the location of the drain in the wall. Most installations, however, use a single trap.
     
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  4. Cass

    Cass Plumber

    Joined:
    Nov 12, 2005
    Location:
    Ohio
    If the inspector wants 2 traps, unless you can get him to change his mind, you will need to install 2.
     
  5. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    traps

    You could tell him that most codes do not allow 2 traps on a single arm because the water from one flowing past the other can create a low pressure area.
     
  6. Winslow

    Winslow Plumber

    Joined:
    Dec 30, 2005
    Occupation:
    Plumber
    Location:
    Hawaii
    is this a double compartment sink, some codes state it is ok to have a trap for each bowl.
     
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