My original basement plumbing had a single arm coming off of the toilet drain/vent to service the bathroom sink.
This year, while remodeling, I wanted to add a deep utility sink/wet bar in my laundry room on the opposite wall.
So I added a 'Wye fitting' and a 90 degree sweep elbow to have both sinks tied together on the same drain.
The utility sink seems to be slow to drain and has a 'glugging' sound. It's a deep 12" sink and can hold a lot of water. So maybe my expectations for 'fast' draining are too high.
But now I'm concerned I misunderstood. I thought when 2 sinks are this close together, and this close to the drain pipe (less than 30") I could simply have 2 drains without need of more venting. Like a double vanity sink.
The Laundry room side has been drywalled, but the bathroom side is still wide open. Should I have added 2 'Sanitary tees' off of the drain/vent for the toilet with 2 arms going in the same direction to service each sink?
In addition, it's only about 30" from the furthest point back to the old galvanized drain. Do I need to add venting?
Or is this all kosher and I might just be dealing with a clogged drain down the line?
I have a few diagrams I drew up in paint. Would either of these be the 'right' way?