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.
Options for venting kitchen sink
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?
With the existing vents I have, what is my best option?
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