This looks like part of a valve that has popped out. I'm "guessing" it is the handle that one would turn to change valve position. I suspect there's a line that goes down and through the floor right there and the valve is the control for that. You could probably just unscrew the line from either side of the broken valve and replace it.
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2000 24' Classic, "We have the technology, we must rebuild it"
Also in the garage, some stuff to pull it:
1999 3/4 ton 'Burb
1993 Roadmaster wagon (well, it probably won't pull it)
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