Larry, I don't have a good teckie answer for you. Ordinarily, there shouldn't be any fuel in the hoses unless there is a problem. The fumes do cause a little muck in the bottom of the tubes. I assume they are there if there was a problem and a safe drain was required.
Without the plug in the hose, unfiltered air would be drawn into the carbs through the hose. Most dealers stock them and have a part number for them. If you describe them as just little plugs in hoses under the bike - they will know what you're talking about. I think the "squirrel condom" term was coined by someone in this forum.
