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Thread: Tailpiece to Trap Rerouting?

  1. #1
    DIY Junior Member DJL's Avatar
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    Question Tailpiece to Trap Rerouting?

    Hello. I'm installing a new double bowl kitchen sink and faucet. We are also strongly considering getting rid of the disposal since we don't use it AND since we are thinking it will provide more usable space in the left cabinet if we get rid of it. Also, note that there is a dishwasher drain line connected to the disposal, though you can't see it in the picture.

    Is there any way to reroute the piping between the tailpiece and trap on the left bowl, so as to maximize usable space on that side of the cabinet? The red line in the picture shows the possible modification I'm talking about. The green line in the picture represents the area I'm trying to free up so I can install a trash/recycling pullout on that side.

    If my idea (red line in pic) is not recommended, then is there any other way to maximize the usable space on the left? There's a lot of space in this cabinet, and it seems a waste to not be able to use some of it.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Some places require separate traps, so allow you to utilize one in this situation. If you can get by with only one with your local code, you could cut and cap the trap arm to the left with enough stub to be able to reuse it at a later date, and redo the right-hand one to cross over, connecting both, then dropping to the trap on the right. They make those cross-overs with a baffle so draining one side doesn't back up into the other (more important with a disposer, but an issue with the pump on the DW, too), and you can get them with a DW tailpiece.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    In the Trades Tom Sawyer's Avatar
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    Piece of cake. Pull the disposal and install a new sink basket and a continuous waste and re-use your old P trap. Cap off the unused drain.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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    Moderator & Master Plumber hj's Avatar
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    Get a 'direct connection" continuous waste and it will be up near the bottom of the sinks and give you maximum space. When you use this, your "red line" will continue to the other drain and connect to it with the included tee. Unless it was really piped to connect that way, twhich would be very unusual, the lower opening should have been a "Cleanout", not a drain connection.
    Last edited by hj; 09-18-2012 at 06:10 PM.
    Licensed residential and commercial plumber

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    DIY Junior Member DJL's Avatar
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    Thank you everyone for your responses. It sounds to me like all three responses point, more or less, to the same solution --> use a continuous waste and cap off or convert the bottom opening to a cleanout. That is assuming that "a crossover with a baffle" is the same thing as a "continous waste"?

    hj, that is an interesting observation about the lower opening probably should have been a "cleanout". I had never considered this. I think I had assumed (without any actual knowledge) that perhaps my city's code required two drain pipes, one to each bowl.

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    Moderator & Master Plumber hj's Avatar
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    quote; that perhaps my city's code required two drain pipes, one to each bowl.

    That would NEVER be a requirement, and even if it were, the openings would have been arranged differently. I am not sure what you mean by "crossover with a baffle" because that has a specific meaning and would have nothing to do with a sink drain. The continuous waste tee, WILL have a baffle.
    Licensed residential and commercial plumber

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    DIY Junior Member DJL's Avatar
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    Quote Originally Posted by hj View Post
    ...I am not sure what you mean by "crossover with a baffle" ...
    I was quoting what jadnashua, the second post on this thread had described. That post said

    Quote Originally Posted by jadnashua View Post
    ...redo the right-hand one to cross over, connecting both, then dropping to the trap on the right. They make those cross-overs with a baffle so draining one side doesn't back up into the other...
    I'm guessing by "crossover", jadnashua was also referring to a continuous waste? Not sure though.

  8. #8
    Retired Defense Industry Engineer jadnashua's Avatar
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    I'm not a professional plumber! I knew it needed to be a part with the baffle...sometimes, the 'proper' names evade me!? but you got the idea.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member DJL's Avatar
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    Hehe....well, you know much more about plumbing than me! Even though the term "continuous waste" was not used in your reply, I was mostly certain that you were describing the same idea as the other two responses. Thanks again!

    Now I have to get to installing that sink. It just arrived yesterday. But wouldn't you know it, I think my drain line to my dishwasher is now clogged. I get a "faucet" symbol on the display and a bunch of beeping during each cycle. Guess that will have to take priority over the new sink!

  10. #10
    DIY Junior Member DJL's Avatar
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    Still trying to figure this stuff out. I want to use an end outlet continuous waste, as suggested in this thread, but my dishwasher is to the left of the sink and the DW drain hose will be too short to attach to the end outlet's DW branch, which will be all the way to the right. Do I need to extend the DW drain hose? Or is there another way to solve this problem?

    Also, are you supposed to slope the waste arm of the continuous waste? If so, how do I accomplish the slope or is the slope built in to the continuous waste to begin with?

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