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Old 03-19-2009, 06:45 PM   #1
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sewer odor coming back up through sink


Please Help! My kitchen stinks! LOL I just bought a house that has the Main sink and then another smaller sink in the island. The problem is that when water is drained from the main sink the septic odor comes up through the drain in the island sink with enough pressure to pop the plug out. After looking at it I have discovered that they used the air admittance valves under both sinks instead of having the vent up through the roof. I have replaced the valves with no improvement. If I take the valves off it seems to work fine with no odor, but the water overflows through open vent. Anyone have any ideas?

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Old 03-20-2009, 08:11 AM   #2
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sewer odor coming back up through sink


there should have put a island vent .is the a trap . I used provents before with no problems .but you need a trap that is what seals out the smell

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Old 03-20-2009, 10:25 AM   #3
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sewer odor coming back up through sink


There is a trap under the sink, but the pressure blows right past the water in it and will even blow out the drain plug if it is in.
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Old 03-20-2009, 10:36 AM   #4
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sewer odor coming back up through sink


Is this something that just started or has it been like this since you moved in ??
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Old 03-23-2009, 03:12 PM   #5
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sewer odor coming back up through sink


This has been going on since I moved in.
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Old 03-23-2009, 09:35 PM   #6
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sewer odor coming back up through sink


Did you purchase a quality AAV or a cheap one?
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Old 03-23-2009, 11:54 PM   #7
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sewer odor coming back up through sink


I you already have a trap in each individual sink: the main , and the island,
then the problem is with the vent. Each sink should have its own vent
because probably the two sinks are far away from each other. The vent in the island is more difficult to install.
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Old 03-24-2009, 05:15 AM   #8
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sewer odor coming back up through sink


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There is a trap under the sink, but the pressure blows right past the water in it and will even blow out the drain plug if it is in.
can you fill the sink a little and watch it drain? Does the water slowly drain and bubble?

that part about blowing out the drain plug is very unusual. Never heard of that before.
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Old 03-25-2009, 10:13 AM   #9
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sewer odor coming back up through sink


I know what your saying and have had it happen before. What is happening is when you drain the main sink it sends positve pressure to the aav and the aav only opens with negitive pressures. So what i would do is look at the drain and see were the main sink ties in and rerout it to tie in behind were the island sink hooks up. Are you will have to get a vent to open air from the island.

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