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Thanks for your comment jimbo. So you are suggesting that when I flush the second story vented toilet, it is creating a siphon? And that the siphon is drawing air in from the unvented toilet on the first story? That is the bubbling that I am seeing? I am much more inclined to believe that the...

Thank you krow for discussing it more, I really appreciate it. So now I just want to be sure that a Y (angled UP) is alright BELOW the toilet for a vent? I cannot vent the toilet properly, I understand this is a patch. But is it a patch that will be functional and not cause too many...

Thanks for your reply krow. Perhaps you could explain a little more? Why would I vent the toilet after the fixture? Won't soil cause problems in the T or the Wye? Why did you leave my Orange vent in the picture? You indicated that those vents would not accomplish anything. The unvented toilet...

I am trying to put a band-aid on a few existing plumbing problems in my 100 year old house. I am adding the green venting in the picture below. The un-vented toilet is on the first floor and the other toilet is on the second. When you flush the toilet on the second floor, the un-vented toilet...

Dunbar, that is extremely helpful and very logical. I appreciate the reply. I will try to get to the attic, but if I cannot, I may vent this way. The two subsequent replies are appreciated, and make sense, but knowing about things that are feasible, although not optimal, is much more...

I have tried to draw my situation. I need to vent a laundry sink (which is is the basement) an I do not have the option of running a new vent to the attic. So must I use an AAV, or can I vent into the main stack even though I am downstream from a toilet? Doesn't seem like I can go in to the main...