Gravity Top Off Outlet

[Fish E]

I saw this diagram and found it interesting. Does anyone have any perspective about what prevents the water from flowing into the sump when the sump level is full? Is the outlet notated by the arrow submerged in the sump and its the sump water pressure holding it back?

 

[fishyjoes]

The text in the middle of the page says "Reservoir out is connected to a float valve in the sump"
Is that what you're asking?

 

[Fish E]

The text in the middle of the page says "Reservoir out is connected to a float valve in the sump"
Is that what you're asking?

I clearly need glasses. I can't believe I overlooked the very first sentence. Thanks for pointing that out!