Laundry Drain top and main floor tied in together?

[yngwie_69]

Please tell me i can do this

[cacher_chick]

Not if you intend to adhere to any legitimate plumbing code.

The lower trap would be required to have a dry vent.

[hj]

Only if you live in Philadelphia and have an engineer certify it.

[yngwie_69]

dont mind the sloppy drawing

[hj]

yes it is. (I need to flesh the answer out because it will not post just the word "yes").