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Thread: Dishwasher Drainage Pipe To Flexible Hose

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    DIY Junior Member ThundrbltMN's Avatar
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    Default Dishwasher Drainage Pipe To Flexible Hose

    Attached is a pic of my under the sink plumbing. I would like to replace my garbage disposer, and reroute the dishwasher draining to the new disposer. The dishwasher drains via that copper pipe you see on the right hand side.

    I would like to attach a flexible hose to that and route it into my new disposer. Can I use a hose clamp for the copper pipe side, or would I need some sort of threaded end for the copper drain pipe?
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    DIY Senior Member Jeff1's Avatar
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    I don't know about the connections you'll need, but you will need an air gap and probably will need to fix the double p-trap under the sink. I'll let the pro's comment more. Don't forget to remove the plug when you connect the dishwasher hose to the garbage disposal

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    Plumbing Designer FloridaOrange's Avatar
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    I would replace what's necessary to have a single p-trap. Dishwasher hose (get rid of the copper) to an air gap and then to the disposal. Disposal to a tailpeice to the single trap.

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    Matt
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    Plumber jimbo's Avatar
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    You have quite a mess there. The dishwasher is in jeopardy of drain back of dirty water from the sink. That copper pipe may be to properly handle a dishwasher pump out. At a bare minumum, you should have a flexible hose from the DW, highlooped up against the underside of the countertop.

    All disposers have a nipple to connect a DW hose to. Be sure to punch out the plug.

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    Moderator & Master Plumber hj's Avatar
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    What do you two have against the double traps? Why do you want to eliminate the present connection since it is just as effective as going into the disposer. You should have a section of hose between the copper and the drain connection, whether you use that one, or eliminate and use the disposer. It should rise up as high as possible behind the sink and then drain down to the connection.

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    DIY Junior Member ThundrbltMN's Avatar
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    Default Drainage Pipe To Flexible Hose

    How would I attach the flexible hose to the copper drain pipe? Are clamps sufficient? That was my real question for this thread.

    Now another related question...Must I use an air gap?

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    Plumbing Designer FloridaOrange's Avatar
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    Quote Originally Posted by ThundrbltMN View Post
    Now another related question...Must I use an air gap?
    Some codes require an air gap, some require only a high loop in the drainage tube from the dishwasher. Air gap is better and safer.
    Matt
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    Enjoying life in SW Florida

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    You can use a hose clamp on the copper to hose connection. The double trap in my opinion is the way to pipe it. If the disposal jams or clogs you still have the use of the sink.

    John

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    Moderator & Master Plumber hj's Avatar
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    The copper tubing is the same size as the drain connection so a proper sized hose will fit over both of them with hose clamps to secure them. You ALWAYS have the use of the second sink even if the disposer jams, regardless of how the drain piping is arranged.

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    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Quote Originally Posted by hj View Post
    The copper tubing is the same size as the drain connection so a proper sized hose will fit over both of them with hose clamps to secure them. You ALWAYS have the use of the second sink even if the disposer jams, regardless of how the drain piping is arranged.
    Not if the trap is plugged

    John
    Last edited by johnjh2o1; 09-12-2009 at 03:35 PM.

  11. #11

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    My code won't allow two traps on a trap arm. One fixture - one trap.

    High loop is allowed here.
    Steve's Plumbing Service

  12. #12
    DIY Junior Member ThundrbltMN's Avatar
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    Quote Originally Posted by hj View Post
    The copper tubing is the same size as the drain connection so a proper sized hose will fit over both of them with hose clamps to secure them. You ALWAYS have the use of the second sink even if the disposer jams, regardless of how the drain piping is arranged.
    So where can I get a hose like this? Obviously, I am a rank beginner at this, but I see this task as very doable.

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