I’ve lived in my house for 5 years. I didn’t know what it was when I moved in, so I stuck a milk crate over it and stored stuff on top of it for years. Anyway I moved that stuff to do some work on my house and noticed this thing is full of water and it slowly leaks, enough to wet the floor around it but not enough to run water anywhere.
I tried poking the end of a drain snake down it and it bubbled some stinky fumes, I wasn’t sure if it was a gas stink or sewage or just rotten old pipe? Anyway I decided I probably shouldn’t snake out a thing that I don’t know what it is, and it’s not in a spot where any drains should be.
It’s at the highest part of my basement pretty much, almost the opposite corner from my floor drain. I’m in Minnesota with an unfinished basement, 1924 house, it has rained a lot recently so the basement is wet in general, clay soil.
Also while I’m asking questions, this other thing in my floor is probably a drain clean out, right?