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Old 11-16-2007, 09:14 PM   #1
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double sink drain piping


had a new counter top with an under mount double sink installed. one side has a disposer on it. My question is since it sits lower and I have a wall mount drain how far below the drain can the p-trap be. or do I need to lower the wall drain down?

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Old 11-17-2007, 12:09 AM   #2
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double sink drain piping


How much lower does it sit now than it did before? Is the new sink a deep well and the old sink standard?

The trap is always lower its the trap arm that goes into the drain in the wall that has to line up. If the sink is the same you should be able to adjust the hieght of the trap on the tailpiece hanging down to make up for the slight drop of the new sink. Have you tried to put it together yet?

If you put it together and the trap arm is lower than the pipe in the wall then you will have to lower it in the wall. This can not be fun sometimes.

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Old 11-17-2007, 12:38 PM   #3
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That one guy.
Instead of having to change the wall drain. why can't you just make up a nipple to fit between the p-trap and trap arm.
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Old 11-17-2007, 02:19 PM   #4
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double sink drain piping


I'm slightly confused as to what you're asking. The top of the P trap should be just slightly above the drain (you want it pitched toward the drain). If the waste for the disposal is lower than the waste rough in the wall you need to lower the drain in the wall.
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Old 11-17-2007, 03:17 PM   #5
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Thats what I needed to know. So as long as the outlet for the disposal is above the wall drain I should be fine.
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Old 11-17-2007, 03:24 PM   #6
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Marlin, So as long as the disposal drain is above the wall drain I'm fine is what your saying.
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Old 11-18-2007, 01:06 AM   #7
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Yes..
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Old 11-18-2007, 02:23 PM   #8
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Thanks Marlin

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