TX Cajun, I hope things get better on this
Want to tell you I understand where you are coming from and You seem very quality oriented and been involved in projects even though perhaps not so hands on with all trades. Sounds as if this project was approached in a verry good manner making this all more unlikely and harder to understand.
My comment on opt out of inspections was to do with rural areas might have been just AZ not necessarily just cheaping out . never did hear though if this is remote area where not too many contractors are available.
Techniques they are using I'm not familiar with, I've actually learned a lot on websites about regional tricks code differences some aren't even quite legal but widespread.
Evidently correct me if I'm wrong a trap is beneath floor ? and the open tee that we see is not for an AAV but a clean out? then it makes a little sense because an AAV or a vent wouldn't be coming off a trap. there must be reason it was plumbed this way? I'm all ears.
You are right...Plumbing and electricity are nothing I ever DIY. Well, I once helped with a wax ring and seating a toilet. Once. Got it done and it was a good seal, but that involved lots of cussing and it wasn't pretty. And, since all of the plumbing in my past projects looked like what I was used to and never had a (noticeable) problem, I never felt compelled to give anything the stinkeye.
My property is in a rural area, but there are plenty of contractors. Right now, home building is on fire and there is way more work than these guys can do. It's crazy busy.
As far as I can tell, everything the plumbers have done has been code compliant, passed all the tests, and passed inspection at each stage. That is until this plumbing that just went in under the sink, specifically what is in the cabinet. The inspector has not been out for that, yet.
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Here's what my builder just reported from the plumbing supervisor regarding his answer to my questions:
"The KS drain is plumbed like a shower drain, the trap arm goes to the wall with the vent. The cleanout is located at the bottom of that wall of other kitchen cabinets. It is plumbed per code. No AAV needed. It is called a deep seal trap and no p trap needed
in KS cabinet."
So, everybody here... Thoughts? (This is interesting but wearing me down.)
Thanks!
P.S. I just received another clarification, that being that the pipe under the cabinet that was looking like consideration for an AAV is actually going to be the cleanout for the plumbing under the sink.