What do you call this?

aby

New member
What do you call the one on the corner that usually drain the water from the main tank to the sump and it has a comb-alike on top of it? (please see below image for more detail)

aquarium.png
 
Corner overflow. Is this a trick question? Cuzz I'm not drunk enough yet
:celeb2::beer:

No it's not a trick question. I am a total beginner in saltwater aquarium and I am not familiar with the aquarium equipment, terms, etc.
 
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