Hi. Need advice on the best/correct way to set up pipe the following situation. Ive included 2 pics below.
My old sink/metal cabinet setup was completely rusted so I removed it. Upon inspection of the pipe it was rusted going down in the drain pipe so I removed all of it. It just lifted out of the drain on the floor. So now I'm left with setting it up and running some pipe.
Background - this drain does not seem to go to the septic tank as all the other waste pipes do. You can see the septic line 4 feet above. I believe this goes to a dry well under the driveway. It is a 2 inch pipe that a 2 inch donut fits into snugly.
The old setup there was the black flexible drain pipe from the washing machine that went directly into the piping,just below the p-trap for the sink. Also there was a heavy black hose going up 7 feet and ending in the beams below the ceiling. I'm assuming this was some form of a vent (however it was not venting out side)
Idealy I'd like to drain right into the pipe as opposed to the sink if that;s possible/allowed.
I plan on putting a counter top from the shelves on the right all the way to the washing machine on the left. Then cut out a section to put a drop in plastic laundry sink. I'd rather not cut another hole into it to run the washing machine's drain pipe into the sink but will if necessary.
I believe the yellow line in the pic (drain into sink ) is okay. Would the green line or the black line be acceptable, directly into the plumbing either above the p-trap or below.
Lastly how would I correctly add a vent to this system. The old way was just a rubber hose going up to the ceiling. Do I need a vent?