I have a plumbing question for the Pit.
I live in an ~ 95 year old house. We had some plumbing things re-done a year or so ago to help set up a laundry room in the basement. Now I am left with two issues.
1. My guest bathroom can develop a foul smell that is definitely sewer gases. We use the bathroom enough that I don't think the issue is a dry trap. The system does have a P trap in place.
2. Whenever someone flushes the guest toilet it gurgles and makes a noise in our kitchen.
https://mail.google.com/mail/u/0/?u...=safe&realattid=1502687290055458816-local0&zw
The picture shows the best I can my current set up. The large pipe in the background coming straight down goes from the guest bathroom toilet into the main sewer drain. The horizontal line to the right of the picture goes to the kitchen. The horizontal line in the foreground is the drain line to the guest bathroom.
None of these lines appear to be directly vented in any way. In an ideal world I think they would vent to the stack to prevent the negative pressure siphon effect and also the backflow of sewer gas. Since this isn't possible I'm wondering if I need an AAV or studor valve?
I'm happy to call the plumber, but wondered if my line of thought is correct. Thanks in advance.