Moving Kitchen Sink Drain Lower, can I swap with the stand tube??


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Old 05-13-16, 08:16 PM
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Moving Kitchen Sink Drain Lower, can I swap with the stand tube??

Good day!

Looking for some help. I honestly have tried to have plumbers come out and do this but no luck where I live.

I am doing a kitchen remodel and the new sink sits 3 inches lower. The current drain disposal height is just at the drain wall level so it needs to be lowered.

I figure these are my options:
-Switch the stand tube and the drain? (This will lower the drain 4+ inches and have least amount of work question is if this is okay to have the vent and stuff above the drain instead of below wherever they meet up at?
-Use only the current stand tube and put a splitter that one end goes to stand tube and other goes to drain?
-Tear some of the wall up to find where these pipes meet the vertical tube and then add a split for a new drain or stand pipe?
 
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Old 05-13-16, 08:32 PM
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Why not just cap off and not use the top drain and just use the bottom drain. a picture showing the whole bottom of the sink and drain connections might help us help you.
 

Last edited by ray2047; 05-14-16 at 11:54 AM.
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Old 05-13-16, 08:34 PM
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I was wondering if this is an island sink and that bottom one is an improperly installed AAV? If that's the case, they should be switched because unless those are two completely separate lines, they were backwards from the get go. A picture from farther back might help a little.
 
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Old 05-14-16, 10:36 AM
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Thanks for the responses!!

The location is on an island relative to the house. Dead center. Therefore I feel AAV (I had to look it up to know what that was) could be it's purpose. Someone went out of there way to install it so figure it has a purpose. It seems an AAV would be a vent w a one way check valve and a p trap would be similar that it would allow air in easy and what comes out would be bubbles (not sure just a guess).

If I switch them around w a p trap there shouldn't be any problems with the drain being below the AAV?

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Old 05-14-16, 10:43 AM
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The drain is SUPPOSED to be below the AAV. Whoever hooked that up originally was demented. The AAV should also not have a trap. Like I said, this is assuming those two lines are connected vertically behind the cabinet.
 
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Old 05-14-16, 12:01 PM
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You may need to open the wall a bit but the lower trap nees to be removed and a sanitary tee installed. A trap adapter installed on the horizontal leg of the tee and a length of 1" PVC pipe up to above the sink drain. The AAV goes on that.

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Last edited by ray2047; 05-14-16 at 12:30 PM.
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Old 05-14-16, 04:25 PM
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If an island it would not need an AAV if set up as a loop vent. The bottom pipe might have been for the clean-out. See if it matches. Check for a clean-out on an nearby wall or look up from basement. Otherwise to verify you would need to remove pipes.

From http://www.inspectcheck.net/client_l...lation%20Guide :

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If this matches then the top connection under sink may be a san-tee with bottom a regular tee.
 
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Old 05-14-16, 05:22 PM
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So what we need to see is the top of the pipe to tell what he has but a loop vent like you show doesn't seem to be consistent with what we have seen so far but given the trap neither does an AAV.

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Last edited by ray2047; 05-14-16 at 05:38 PM.
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Old 05-16-16, 10:37 AM
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I second Ray's question. It looks like the standpipe is there for the dishwasher drain.

If so, the dishwasher can/should go directly into the disposal, then everything drain from there.
 
 

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