Correcting kitchen sink drain incorrect slope

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Just.Dave71, Nov 24, 2019.

  1. Just.Dave71

    Just.Dave71 New Member

    Joined:
    Jul 4, 2019
    Location:
    SoCal
    So...double sink. Has always been slow, even when clear. Never occurred to me until yesterday. Just happened to have 8" galv nipple stickin out by itself and notice that it slopes toward the trap. Both sides do. Explains excessive buildup and corrosion in nipples that have been noticeable in times past.

    So...would like to replace with 1-1/2" ABS DWV. Just cuz. My intent was to glue in the trap arm with correct slope angle. Thought maybe using trap adapter, gluing fixture drain line at a slight offset, but I'm a little stumped the best way to go from behind wall (Galvanized? Cast? 1964 build.) to sink, whole run 1-1/2" ABS...?

    Dunno about the tailpiece. Just whatever's available, then 1-1/2 in. ABS DWV Hub x Slip P-Trap? Then...?

    My apologies if this is a no brainer, and for any vagueness...
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
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  4. Just.Dave71

    Just.Dave71 New Member

    Joined:
    Jul 4, 2019
    Location:
    SoCal
    Hang on tho...the nipple slope, created by the female threaded hole where the nipple threads into...something isn't right there, and a nipple threaded in here is where the incorrect slope originates. That's the entire purpose of my attempt here. To mitigate the apparently 'crooked' nipple hole in the vertical line.
     
  5. dj2

    dj2 In the Trades

    Joined:
    Aug 13, 2013
    Location:
    California
    How about a pic of your existing set up.
     
  6. MKS

    MKS Member

    Joined:
    Apr 15, 2016
    Location:
    Illinois
    The trap adapter at the wall as mentioned above gives you flexibility to set the slope.
     
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