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Old 02-05-2012, 01:51 PM   #1
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Island sink drain problem

I began to get a gurgling sound from my kitchen island sink about a year ago. I have read that venting problems can cause this. I found that the island sink used an air admittance device (AAV), so I replaced the AAV with a new Studor AAV. The problem continued, so I snaked the vent to the kitchen sink from the roof vent. I then snaked the drain from the kitchen sink thinking that a partial blockage would cause the air in the drain line to backup through the island sink. I did not bring anything up when I snaked the kitchen sink drain nor find anything other than a little waste on the snake when it was brought back.

I then tried to snake the kitchen island drain but the snake would not go more than a few feet into the drain. The island sink drains well but I tried to snake it just because I had the snake and could not think of anything else at the time.

The problem continued so I went into the crawl space to look at the plumbing. I found the following, a few inches under the floor is what appears to be another trap, but not the normal P trap but one that is glued. The pipe comes through the floor, goes into a 90, travels approximately 3 inches, goes into another 90, travels up about 3 inches to another 90, and then goes off in the direction of the drain line. All drain, waste, vent piping is ABS (black) plastic. I believe this second group of 90s makes what is called a double trap.

I want to cut out this group of (3) 90s and install a long sweep 90 but I have to crawl all the way from the other end of the house and only want to do this operation once if you understand my meaning.

Is this a workable solution?
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Old 02-05-2012, 02:20 PM   #2
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If there is another trap inside the island I can think of no good reason to have the 2nd trap under the floor.
Id eliminate the 2nd trap under the floor


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Old 02-06-2012, 10:56 PM   #3
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I read your post because I am trying to figure some venting issues of my own. My comment is probably moot as following "plummen" I feel you can't go wrong. However,you mentioned the pipe with all the 90s goes up 3 inches at one point. In my readings I learned this might be called a "broken vent". A vent improperly installed but works ineffectively. Hence the gurgling. A step up" breaks the vent. I would be interested to hear from you or anyone if this makes sense. I would get back up on the porch and let the big dogs hunt if I'm way off with this. Way off or not I'll get on the porch.
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