Hi Jamie; Yesterday, you asked: >Betty - are you talking about the outlets for a central vac system? I am... unfortunately I am unfamiliar with them and have never had one myself. This posting came because of a story related to me. I know of one person who has one and measured the opening on her system. The story originated from a person who had a "closed" system that remains off as long as the cover remains on, but is activated the moment the cover is off. I have heard about different variations on a theme such as the button type you have referred to, as well as a being activated only once the hose is connected. I think that anyone who has one of these systems should merely check to see what version of the product they have, and try to figure out what the potential dangers could be and find a way to prevent an accident from happening to one of our furry friends. Betty and Her Blur O'Fur For the Love of Ferrets... [Posted in FML issue 3157]