garbage too low for drain pipe's p-trap?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by silvertam, Feb 27, 2008.

  1. silvertam

    silvertam New Member

    Messages:
    3
    Location:
    virginia
    today we had a new counter top and under-mounted sink put in. this new sink is MUCH deeper than our old one. making our garbage disposal much lower than it was before.

    i'm not sure how to connect this to our drain pipe (that's too tall now). i'm afraid if we shorten this drain pipe, we will become too close to that p-trap's height and prevent it from working properly. is there a certain height the pipe coming out of the p-trap should be before connecting to a garbage disposal etc?

    also, if we have to shorten this PVC pipe coming from the p-trap what's the best way to do that? or can i go to the hardware store and find a new p-trap and maybe a connector piece that comes up and not have to shorten and reattach anything?

    :confused: thank you for your help!!!!!

    [​IMG]
    Last edited: Feb 27, 2008
  2. That'll work. Just install an adaptor to go from tubular to SCH40 PVC.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,641
    Location:
    Cave Creek, Arizona
    trap

    The very first thing I would have done, even before installing the disposer, would have been to cut the pipe coming from the wall so I could adapt to a tubular trap. Then you would not have had the problem in the first places and we would not have heard from you.
  4. silvertam

    silvertam New Member

    Messages:
    3
    Location:
    virginia
    we didn't know they would be installing a sink like this. surprise!!

    so, looking at the problem at hand. could we:

    1. disconnect the p-trap (you can see it's silver connector) and shorten the pipe going up from it? (not sure how to do this)

    2. perhaps even easier... disconnect the p-trap and replace it with a new p-trap that has a shorter pipe already connected to it going up? do they make any preset pipes like this?

    3. a mix of shortening the pipe coming up some (either purchasing it or making it) and shortening the garbage disposal pipe coming down?

    thank you so much for your expertise! i really appreciate any and all help!
  5. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    What I would do is cut off the trap entirely near the wall. Glue on a trap adapter, Then a new tubular trap like this one. Cut the wall outlet to the proper length.

    [​IMG]
  6. led35

    led35 New Member

    Messages:
    7
    its fine

    Make it easy and cut it where you have it marked. It will not affect the effectivness of the trap.
  7. led35

    led35 New Member

    Messages:
    7
    or even a bit higher, looks like you've got a few inches to work with.
  8. Terry

    Terry Administrator Staff Member

    Messages:
    15,005
    Location:
    Bothell, Washington
    I agree with redwood and hj,
    We always cut near the wall, and use a new p-trap.
    That way, you have a lot more adaptability.
  9. patrick88

    patrick88 Plumber

    Messages:
    836
    Location:
    Webster Ma.
    If you try to reuse that trap you might find it is off a 1/2" or so. Cutting the trap off and starting fresh will save you time and money.
  10. Redwood

    Redwood Master Plumber

    Messages:
    7,450
    Location:
    Connecticut
    The chances of that old trap lining up properly is slightly less than slim and none! Certainly not worth playing with.
  11. silvertam

    silvertam New Member

    Messages:
    3
    Location:
    virginia
    thank you all so much! we were able to shorten just that pipe going up and the garbage disposal line going down. so just trimming those pipes worked out PERFECT!!! :) we bought other pvc in case we had to redo that whole line (like many suggested), but we got it right in the first try.. why fight it?
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