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Discussion Starter · #1 ·
The options I’m familiar with are AAV, loop, and oversized wet vent. I’m trying to decide which to use and hoping wet vent is an option. AAV isn’t allowed here. I’ve posted a picture of the existing plumbing below the kitchen. As you can see, most of the plumbing is located just below the kitchen, as it backs up to a bathroom. Upstream is a second full bath. Downstream leads to sewer. The kitchen sink will tie into the main 3” line downstream of all existing plumbing. Unfortunately for me, the kitchen sink will drop down right above that main hvac trunk

With the existing vents I have, what is my best option?
 

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A kitchen sink does not need a vent as the open sink drain provides that function. A dishwasher needs an air gap but not the sink.
 

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A "Handy Husband"
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A kitchen sink does not need a vent as the open sink drain provides that function. A dishwasher needs an air gap but not the sink.
Absolutely wrong. Venting is connected after the P trap, the drain is in front of the trap.

Sent from my RCT6A03W13E using Tapatalk
 

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Why not vent up into the attic and out the roof at the sink with an individual vent?
Or, you said the kitchen backs up to the bathroom. Is there a vent in that wall you can use as a vertical wet vent?
I tried to find your state code online but what I saw is not how we plumb in my state
 

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Discussion Starter · #5 ·
Sorry, I thought I put ‘island’ in the title. It looks like the loop is the only truly correct way to do this. I just have to get that foot vent through a couple joists to where I can tie into the tub vent, which is dry below the floor.
 
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