1 1/2" Bathroom Sink Drain

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by chefwong, Jul 3, 2013.

  1. chefwong

    chefwong New Member

    Messages:
    710
    Location:
    District of Columbia
    Is there any benefits on using a larger sink drain "1 1/2" for the bathroom sink......obviously on the inlet, there is a 1 1/2-1 1/14 nut on it.

    It's always the sink stopper/drain that is the culprit on slowing down the flow
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,636
    Location:
    Cave Creek, Arizona
    I don't know where you would find a 1 1/2" lavatory drain, unless it was a special order. But, there would be no benefit, since the annular opening under the stopper is a lot smaller than the 1 1/4" tubing.
  3. chefwong

    chefwong New Member

    Messages:
    710
    Location:
    District of Columbia
    Standard 1 1/4
    1 1/2 Trap with the downsizer nut on the trap 1 1/2 to 1 1/4
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,636
    Location:
    Cave Creek, Arizona
    It is how I usually do it, but only because that lets you drop the tailpiece further into the trap, making an easier connection process.
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