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Today's game of "What is this thing?" Some kind of drain plug?

What is this thing behind/under the aft bench seating in my gs232? It looks like maybe it should be a drain, I'd LIKE it to be a drain because water accumulates there, indeed if it is not a drain I am thinking about drilling a hole in it.
There's a hard plastic ring and a metal bottom which doesn't seem to have any outlet when I feel around in there. I can feel that's it's metal and rap it with the tip of a screwdriver.
It's almost like a drain was supposed to go there but somebody put some sort of spacer in the hole instead?

Answers