Crazy Kitchen Sink plumbing

[Ryan 901]

This is the original construction piping at the house, just tonight, I took it apart to clean it out. Needless to say it was pretty bad. This has always bothered me but finally am taking a good look at it.

I am pretty handly, but probably will seek professional advice, but does anyone have any theories about what the builders were smoking? Why does it tie together above the trap and then into the wall into two places? I assumed both were drains, but maybe something else is going on.

Any thoughts?

 

[Reach4]

That top trap white pipe from the wall could be water from something such as the AC condenser drain, or even a softener.

 

[Sponsor]

 

[FullySprinklered]

Somebody cleaned off the shelves down at Depot. Major piece of overkill.

 

[MACODEDOC]

IN SOME JURISDICTIONS A SEPARATE TRAP IS NEEDED FOR THE DISHWASHER, THIS IS WHAT I THINK IS GOING ON, AND THE CONNECTING OF THE 2 BOWELS SHOULD BE DONE WITH 1 TRAP WITH THE GARBAGE DISPOSAL HAVING THE TRAP AND A A WAST ARM OVER FOR THE OTHER SIDE. THE USE OF THE DOUBLY WYE IS BACK PITCHING, JUST NOT A GOOD JOB AT ALL. I HOPE A LICENSED PLUMBER DID NOT INSTALL THIS BUT IS THEY DID SHAME ON YOU. RIP OUT AND HIRE A LICENSED PLUMBER. AND FILE CORRECT PERMITS SO EVERYONE IS COVERED.
NO NEED FOR AN INDIRECT WASTE TO TIE IN LIKE THAT, ALSO THE FAUCET SUPPLY LINE IS COUGHT AROUND THE TRAP

 

[Plumber69]

Is the a bathroom on the other side