Hah. I tried doing some research about what this kind of drain is called, but I have no idea. I’ve never had a drain like this before, but I guess it must not be too rare?

In my case, the issue is that it starts to stink a lot. We had a plumber out a few years ago, and he opened that thing up and used a plunger to remove a ton of hair. He then suggested we wash it out every now and again, but I haven’t been able to do it for a while now, since I can’t get that thing open.