Under the category of " What the hell is this?"

You know I run my own plumbing and heating company. I have to tell you sometimes homeowners do the dumbest things because they are too cheap or too dam stupid to admit that they have no glue what they are doing. What is this?

Any idea?
Believe or not it is the drainage for a vanity sink and laundry. You might ask yourself what is moral of this story.
Hire a professional and do things right the first time.
Have a great day fellow steemers