Thanks guys, turns out it's just a drain for the deck cooler/container. The tube connecting them was just so clogged with sand/dirt that it was draining initially. Now it's all cleaned out.
To answer your question it's about level with the cabin floor, maybe slightly above.
I took a closer look at it today and what I thought was a neck down from ~3/4" to 1/8" was really just compacted sand/dirt. After cleaning it out it appears as if the fitting is connected to a hose on the...
I recently purchased a 93 200 Overnighter and have been fixing it up & learning what I can about it. One of the things I can't figure out is what this thru-hull fitting is. Despite the size of the fitting the actual hole thru is maybe on 1/8" in diameter.
Any idea what it is?