The hole in the Swaros serves two purposes: (1) an access port so they can pump nitrogen in and (2) it serves as a drain to let water out. Since nitrogen is slightly lighter than air all the user has to do is keep the hole pointed downward. With the hole pointed downward, nitrogen stays in and excess water drains out. It's really a very elegant design.
John
3 3 3 3
Better joke than Bop Hope and Jack Lemmon combined or
most horrid nonsense in years.
Guess what?
Sigmund F.