It's been a while, but as I recall that is not a drain hole, but rather a plug which indexes the internals of the station. Does the plug you removed have a little indexing pin that fit into the slot? If I recall, the slot is what allows the shaft to extend/retract as the suspension is raised or lowered.
Seems to me the real drain plug is inside the hull, where you can make the most mess.
Again, it's been a while.
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