What are these outlets for?

[DigdirtJen]

Inside my waterfall spillway is a little box that is open on the bottom. It sits about ¾” from the bottom of the spillway box and has 2 little openings in the top. Does anyone know what these 2 little openings are for? Excuse my attempt at an illustration but hopefully this picture will help. The blue parts are what I’m asking about. Thanks!

 

[JamieB]

From your drawing, I’d almost think air ports, don’t know cause I’ve never used one like that.

 

[DigdirtJen]

That's what i thought they looked like, but i can't imagine how you could use those for air since water is being pumped into the box.

 

[Lisak1]

Could you add airlines from and aerator maybe? I don't know... that's a new one! What brand is it?

 

[addy1]

No clue but interesting.

 

[TheFishGuy]

I used to have that exact waterfall box, the water comes out the bottom portion in the port type thing, and so I always thought it was just an airport for the air bubble that may get trapped in the area below to escape.