I bought an old house and this is the old kitchen drain setup:
Frankly I never "tested" it before I remodeled the kitchen completely. The old kitchen has drop-in sink and now mine is under-mount.
With the new kitchen, I found out the garbage disposal is only 1" above the drain (I used a shallower sink vs. deep sink previously):
Here is another view:
To connect (A) + (B) to (C), I am thinking of two options:
I need to find a new (D) so that P trap is lower a bit and I have to find a pipe with a short L shape at the end to connect to (C)
Find some "built-in T shape P trap like this:
I am not sure if such thing exists.
The question is: What piece or how do I even create the connection from sink + garbage disposal --> drain pipe outlet?
So I was able to figure out the right "configuration" for this:
I made (A) longer and cut a 90 degree elbow really short (B). But that required me to push down the plastic drain pipe at the wall a bit, like 3/4" or so.
The result is that the connection in green circle above ended up at an angle like so:
There was no leak at that point so I was OK but then there was a leak below BUT I tried to use a bit of plumber putty inside and the leak stopped:
I know plumber putty is not supposed to be used in this case but I had no other choice. I hope it lasts for awhile but please tell me if otherwise. The reason it was leaking is "probably" because the whole P trap was pushed down 3/4", causing the "lip" not getting flushed to the "mouth" of the P-trap. I was just guessing...