Good morning all, been reading up a bunch on the forums after purchasing a new-to-me home. It's an old house that used to just be an outbuilding so there's a lot of barely legal stuff going on plumbing wise, and I'm trying to figure out what to do for now to stay safe, and what to do in a few weeks when I do a minor bathroom remodel that might allow some better fixes. The plumbing for my house has no vent to the outside, only an AAV/Studor vent in the basement that comes off the toilet down-pipe. I've attached pictures of the area (I think) below. I discovered while I was cutting into the drain for a washing machine in the basement that the AAV near the toilet had been taken out so I just have an open pipe into the basement! Obviously a problem. So I went out and grabbed a new AAV and installed it, but when I did, the toilet stopped flushing completely, so I'm betting the AAV isn't allowing enough air in for the toilet to pull its siphon and complete a flush. Now, like I said, I'm hoping I can run a roof vent while I'm replacing my vanity in a few weeks/months and that will fix the problem better than the AAV, but until then, can you all recommend something so that I can be safe in the meantime? Or is there a good way to install that AAV so that I don't have to run the roof vent at all? It's legal to do so in my jurisdiction but I want my fixtures all to drain right also! Picture descriptions: 1. The toilet pipe with the AAV stub coming off to the left. 2. You can see the toilet pipe on the left-ish and the house drain running out the right side of the image. 3. New washing machine connection, 24" standpipe, p trap, wye and 45 to a new AAV and drain to the system off right. 4. Sink and bathtub connections running down to the 4" main drain. Thanks all!