Return bend only, for kitchen sink trap?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by chassis, Jan 23, 2010.

  1. chassis

    chassis Engineer

    Joined:
    Sep 12, 2005
    Occupation:
    Engineer
    Location:
    SE Pennsylvania
    Good afternoon all,

    I am replacing an old metal drum trap, presently installed in a kitchen sink/disposer situation. The outlet from the disposer is about 3" above the horizontal trap arm. My problem is I don't think a standard PVC 1-1/2" p-trap assembly will work. It seems to me the trap will need to be lower (driven the disposer waste arm) than the existing copper DWV wants it to be.

    So the question is - can I use a return bend (hub x hub) only as a trap? On the inlet side, I would install my own vertical tailpiece with a trap adapter, to attach to the disposer waste arm. On the outlet side, I would install a vertical run, with a 90 deg. elbow, followed by a run of horizontal pipe to the copper DWV.

    Is this an OK installation? I am eliminating the normally-provided (in Home Depot) trap arm component of a p-trap assembly. Thanks for any replies.
     
  2. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Your description of the solution is very convoluted. IF the disposer outlet is 3" above the wall pipe, there is NO reason why you cannot use a standard "P" trap, assuming you do the piping properly.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. chassis

    chassis Engineer

    Joined:
    Sep 12, 2005
    Occupation:
    Engineer
    Location:
    SE Pennsylvania
    Thanks for the reply hj. I will see if I can make a standard 1-1/2" PVC p-trap work.
     
  5. MASTERPLUMB777

    MASTERPLUMB777 Member

    Joined:
    Aug 6, 2007
    Occupation:
    Retired Master Plumber
    Location:
    Texas
    they make and sell to diy ext. Tube pipes with a slip joint nut on top that will extend

    into your standard p-trap that's how professionals do this kind of problem !

    Do not " use a flexible " type extension they are not code legal and are

    a stoppage waiting to happen

     
    Last edited by a moderator: Jan 24, 2010
Similar Threads: Return bend
Forum Title Date
Plumbing Forum, Professional & DIY Advice Hot Water Recirc. w/ dedicated return Thursday at 10:27 AM
Plumbing Forum, Professional & DIY Advice Laying water return line on top of framing for ceiling (CPVC or PEX)? Nov 11, 2015
Plumbing Forum, Professional & DIY Advice Dedicated Hot Water Return Line - Concrete Foundation Mar 13, 2015
Plumbing Forum, Professional & DIY Advice How to tell if I have a hot water return line Nov 7, 2014
Plumbing Forum, Professional & DIY Advice you will go with one-pipe monoflo setting or two-pipe reverse return setting? Aug 24, 2014

Share This Page