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Old 04-24-2014, 03:57 PM   #1
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single to double sink problems.


So I got a brand new double bowl vanity. 1 drain stubout. what I did was used a Y connection at the stubout, ran sink 1 ptrap off the extension tube. over aprox 20 inches and connected sch. 40 PVC into the Y. Drain 2, extension tube Ptrap then into the Y connection. I used an air admittance valve off the top of the Y because I thought it would fix this problem.

The problem:
when sink 1 is on it fills up rather quickley and drains slowly. When sink 2 is running it drains fine but sink 1 starts to fill back up (back feeding into sink 1.) all lines were routed with schedule 40 PVC, 1 1/2 inch. I personally feel that its too much water rushing for the single drain outlet to handle or maybe a partial clog somewhere? Please help!

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Old 04-24-2014, 05:06 PM   #2
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single to double sink problems.


Welcome to the forum mikemarshall150.

Water will take the path of least resistance.

Introduce yourself a few more times and please post some pics of under the sink setup so the plumbers can better assist you. Thanks.

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Old 04-24-2014, 06:06 PM   #3
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single to double sink problems.


I am an advanced DIYer. I have work on numerous projects and have basic knowledge and understanding. Law is my day job but I have enjoy tiling, drywall and doing my own projects.
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Old 04-24-2014, 06:08 PM   #4
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single to double sink problems.


Not vent issue. Partial clog, snake the line.
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Old 04-24-2014, 06:48 PM   #5
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single to double sink problems.


I do have access where the 2 1/2 inch brass drain line goes into a y into the main stack in my basement (ranch house). I will disconnect that line and run a snake and see what I can find. I know its not near the vent because I replaced the vent during a bathroom remodel and the cast iron looked brand new. Finger's crossed. !!
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Old 04-24-2014, 08:52 PM   #6
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single to double sink problems.


In order to clear the drain line snake from the sink drain trap adapter under the sink.
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Old 04-24-2014, 09:26 PM   #7
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single to double sink problems.


I snaked the line just before install. Could the problem be where the brass 1 1/2 meets the main line ?
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Old 04-24-2014, 09:29 PM   #8
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single to double sink problems.


Do us a small favor and post a picture of what you have done.
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Old 04-24-2014, 10:12 PM   #9
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single to double sink problems.


I will post a picture when I get a chance tomarrow. everything is brand new except the stub out in which I did run a manual snake down about 10 feet or so and pulled it back out. I was thinking about it and I did have a slow drain even when I had the single vanity. drain cleaner would fix the problem for about a week then back to a slow drain. Would I be wrong is saying that I do now think it is a clog slowing things down.? That drain should not be backing up so quickley. 1 1/2 inch drain pipe should be able to take a substancial ammount of water from both sinks before filling and bringing the water back up the ptrap. Correct?
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Old 04-24-2014, 10:32 PM   #10
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single to double sink problems.


1.5" is code compliant for the trap arm. I agree with others that your line is plugged.

Don't use a chemical cleaner though-BAD stuff. Use a snake for best results.
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Old 04-25-2014, 12:09 AM   #11
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single to double sink problems.


double sinks on a 1 1/2 arm is stretching it, not allowed under IPC partial clog plus over loaded waste arm equals your problem, assuming theres nothing else piped in wrong.

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