Vanity sink trap - can I use 90's after the trap?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by chassis, Jan 6, 2006.

  1. chassis

    chassis Engineer

    Messages:
    339
    Location:
    SE Pennsylvania
    Installing a 60" dual sink vanity in a master bath. Each has its own 1.5" drain stub out.

    To maximize space inside the cabinet I would like to route the drain piping in the manner best suited to the layout. What it means in English is i want to use up to 3 90 degree elbows downstream of the trap.

    The sink tailpiece will go directly to the trap, but after the trap I want the feedom to route the pipe to my liking. Is it OK to use 90s after the trap?

    Thanks.
  2. Cass

    Cass Plumber

    Messages:
    5,980
    Location:
    Ohio
    No, the trap should go directly to the stub out.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,874
    Location:
    Cave Creek, Arizona
    elbows

    Since you may already have an elbow in the wall, that would make four 90 degree turns and two is normally the maximum number allowed. And when your drain plugs up those extra elbows are going to make it very difficult to unplug it.
  4. chassis

    chassis Engineer

    Messages:
    339
    Location:
    SE Pennsylvania
    Thanks guys. The lightbulb went off when I was in the Lowe's plumbing dept. I figured I could use 2 wall pipes which have 90 deg. elbows built in. I think I over thought this one, thanks again.
  5. dubldare

    dubldare Plumber/Gasfitter

    Messages:
    286
    Location:
    MN/ND
    By MN code, a trap arm can only be offset a maximum of 90°, using either a long sweep 90 or 2) 45's.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,874
    Location:
    Cave Creek, Arizona
    90's

    If you were planning to use 1 1/4" "flush ells" which have slip joint ends, then you would have had a drain that fell apart everytime you bumped it.
  7. chassis

    chassis Engineer

    Messages:
    339
    Location:
    SE Pennsylvania
    Well here's the status. One trap went real well and I didn't need any 45s or 90s. Just an extension tube and everything is fine, nice and dry.

    The other trap (2 sink vanity) is farther from the stub out. I only had to use one 45. The problem is that the 45 is chrome with slip joints on either end. Everything else is plastic tubing, 1 1/4". I think you're right in that the chrome to plastic connection is not real solid. Neither Home Depot nor Lowe's had 1 1/4" plastic 45s. What gives? Should I keep looking for a 1 1/4" plastic slip joint 45 or do I need a different approach?

    Thanks for the help.
  8. chassis

    chassis Engineer

    Messages:
    339
    Location:
    SE Pennsylvania
    Hope to get some feedback on this. I'm not sure what the next step is to fix the one trap that is leaking. I think I need a fitting that's not available at HD/Lowe's, or I have the piping wrong overall. Thanks.
  9. chassis

    chassis Engineer

    Messages:
    339
    Location:
    SE Pennsylvania
    Hi guys. I would really like some advice with this. Not really sure what my options are. The issue is I get a good fitting setup if I use plastic tubing in a sink trap, with the exception of one chrome 45 degree dual slip nut fitting. Problem is the chrome to plastic joint is not real solid. If there is such a thing as a 45 degree dual slip nut *plastic* fitting, I would be in business. So far I can't find such a thing.

    If a 45 deg. plastic fitting exists, just not at HD/Lowes, it would be good to know this. Yes/no?

    If I am totally in left field, please let me know. As it stands I have a leaking sink trap and don't really know which direction to turn. Thanks alot for any pointers with this.
  10. chassis

    chassis Engineer

    Messages:
    339
    Location:
    SE Pennsylvania
    Latest update on this. Still don't have a solution.

    I'm going to try the following. FYI I have a bronze DWV fitting in the wall with male 1 1/4" pipe threads.

    If anyone cares to offer their $0.02 on this I would greatly appreciate it.

    Starting from the sink tailpiece:

    1. Plastic extension tube, plastic slipjoint nut
    2. Plastic p-trap, plastic slipjoint nut
    3. Plastic extension tube, plastic slipjoint nut
    4. One side of a 1 1/4" trap adapter. Bronze slipjoint nut
    5. Other side of trap adapter. Sweat connection to 1 1/4" copper
    6. Short 1 1/4" copper pipe, sweated to adapter and 45 degree copper elbow
    7. 45 degree copper elbow, sweated to 1 1/4" copper pipe on both sides
    8. Short 1 1/'4" copper pipe, sweated to 1 1/4" female pipe thread adapter
    9. Female pipe thread adapter, attached to bronze male fitting in wall stub out.

    Attached Files:

  11. chassis

    chassis Engineer

    Messages:
    339
    Location:
    SE Pennsylvania
    It's been about 2 hours and the trap has not leaked, even with sustained hot water running through it! Yippee! I plumbed it using the sketch above, but without the extension tube between the p-trap and the trap adapter. Had to use teflon paste in all the threads (plastic and copper) in order for it not to leak. What a bugger this was.
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