This is my tank overflow. Definitely no bean animal, herbie or durso... Just one drain at the bottom flowing down to the sump in the basement. No noise, though, but the flow is not that high. And the top of the overflow has a styrofoam cover and is inside a closed canopy. I clean the teeth at the top with a toothbrush every few months, to prevent any algae build-up. It's been this way for 13 years, and never a problem.
