kachel
That smelly pipe stuck in the floor (or wall) that your radiator is attached to. It’s like the sewer of your room, but less fancy and more gross.
My teacher said my math was as bad as a kachel. I said I’d rather be stuck to a pipe than do algebra.
The kachel is leaking. I’m going to sue the school. I’ve got a lawyer who’s also my cousin.
My radiator is making noise. I think the kachel is screaming in pain.