First, this questionable DWV pipe arrangement under the kitchen sink makes me wonder if the open vent pipe at the top left needs an air admittance valve?
Both traps appeared to have water in them, but I don’t understand how the setup automatically primes the trap on the left. A scan with my thermal infrared camera indicates that both traps had water in them.
Secondly, I saw this open vent under a sink the the laundry room/garage. Should this open vent have an air admittance valve on it?
That pipe on the left side of the sink should have an AAV on it. In the other photograph, it appears the clean out plug is missing from the sanitary tee.
That would make sense to me, even if it was kind of small for mechanical cleaning and sewer scoping (2”?). There was a cleanout for mechanical cleaning and sewer scoping on the opposite side of the garage. Thanks, Martin.
The pipe on the left was likely set up for a dishwasher drain. But correction isnt just adding an AAV on top, because there is another opening on the back side of the wye. It should just be cut lower and capped at this point.
I understand that it was likely set up for a dishwasher drain.
What I was going to write into the report was:
A drain waste vent pipe underneath the kitchen sink was missing an air admittance valve at the top, and was missing a cap at the wye. A licensed qualified plumbing contractor should evaluate and repair or replace as necessary and according to current standards.
