Water accumulated in Jack well


1st post here

I found a little surprise today. My jack is corroded well past the point of being able to use it. (Thankfully never had to but never thought to check).

Any thoughts on how water is getting in to the compartment?

Is there supposed to be a drain?

I noticed a vent flap to behind the quarter panel, but it doesn't look like the water is coming through there.

Thanks in advanced

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That's insane, there should be a drain plug back there.