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That's a relief. So you're saying that it would have been best to keep the vent at 45 degrees, but a wye does that, though. So the combo is okay, but the wye or tee is better, right? Or only a wye is best? Just making sure I understand

Okay, so I'll add the vent for the washer (dotted lines, joined with a combo on its back), and take out the middle vent, as it doesn't serve a purpose. Both lines will be vented. Then will stack tees for washer and dryer. 1. I connect to the horizontal main drain line (3" PVC, in crawlspace)...

You mean to stack the combo tee-wyes? I saw that pic before. But they didn' use a 4-way in your pic, because the lines weren't coming from opposite sides, don't you think? Wouldn't a 4-way be better in this case?

I've searched a million articles and haven't come up with a solid answer to this... I'm converting the previous owners' bathroom addition into a bathroom/laundry room. I need to run the sink and washing machine into same drain/vent but from opposite sides. I've attached two pics. All lines are...