Can anyone assist with a very basic explanation of what a chest tube does and how. I remember when I was in nursing school, an amazingly intelligent instructor explained the thoraseal by comparing it to a bucket of water. I have not had to explain a chest tube to anyone in a long time, and I have searched and found many articles on how to care for them, what to look for, what to do and not to do. But I am looking for that one simple explanation that will make my staff say Ahah! I am looking for the so called blood & guts of what it is doing, not how to care for it. Actually, now that I think of it, I am looking for an explanation of the 3 chamber thoraseal collection unit, not the chest tube. Thanks.