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In the attached picture, there are three "holes". One is the drain and has the drain plug attached to it. Another is covered by a screen and is, IIRC, the input for water going into my live wells.
So, what is the "hole" that is in the ten o'clock position relative to my drain? It appears to have a rubber grommet looking device on it.
Any and all help is appreciated.
Thanks in advance.