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Discussion Starter · #1 · (Edited)
Since I am redoing the plumbing, I decided to tackle the kitchen sink as well. as you can see by the picture, we have a dishwasher, a reverse osmosis drain (blue tube), a dispoal (middle sink) and two sinks. It gets clogged every other day or so. I am assuming this is because there is no vent. Under the floor it runs 9 feet and has elbowed into a back tee 1.5 X 3 in a horizontal 3 coming from the bathroom.

I'm going to put it into a back wye 1.5 X 3

My question is, should I redo the whole thing? or can I just put in an AAV vent under the sink?
 

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A "Handy Husband"
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Where is the clog occurring? I would change that S trap to a P trap and install an AAV.

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After a renter completely clogged my GD and then said 'the dishwasher doesn't drain' either, I had to call the handyman. He unclogged the GD and I backcharged the renter the repair cost from security funds.

Later discovered the GD had split apart, hairline crack. Decided to remove GD completely from rental unit. Renter stated 'We don't have a GD where we live so we were unaware that certain things are a no-no.'

No way to screen renters to that level.
 

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A "Handy Husband"
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Is that P trap installed backwards?

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Connecting to a horizontal pipe in the basement:
Going in the top a sanitary tee is ok.
Going in the side a wye is needed and a 45 if necessary.
Going in at a 45 degree angle, 45 or less is a wye, over 45 to 90 is a sanitary tee.
 

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Vent it with an aav install a p trap. Remove the cross connection to your water from the reverse osmosis and run that to the basement with an air gap. Also remove the non AAV and get an AAV they do not have springs.


Did I mention the cross connection to your water. Not fun to drink waste water.
 
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