We moved into a new rental last month and after we moved in I notice some unusual plumbing.
The kitchen sink drain pipe goes into the wall and comes out the other side in a pantry before exiting through the floor. The weird thing is that it also vents directly into the pantry from the soil pipe. There's no valve of any kind on the pipe, it's just cut and left open. Here's a picture.
I don't have a great understanding of plumbing, but I thought that everything needed to be vented to the outside, and that venting any kind of plumbing inside is bad (health risks, pest risks, odors, fire, etc). I can't find anything specific online that will confirm how serious an issue this is in a specific way, only that this is not the right way to do it.
Plumbing experts: if this is no big deal, let me know (that'd be great). But if it is a bad thing, can you point my to some plumbing code (I'm in CA) or any reference material that I can use to motivate my property manager to address it? I've rented from him for years (in another building, just moved into this one) and he's great about taking care of little things but stuff like this needs serious prodding.
Details: 1908 building, I'm on the second of four floors but not sure of what kind of plumbing is above or below mine (but I do know that the layouts are different from my unit). Thanks.