Tell us about yourself!
I work in a research lab. The fastest way I could figure this one out is to use one lab rubber stopper (you want to go with #2 to fit the airbed's Boston Valve). Just get one without any holes in it and punch it through with a needle that any compressor normally comes with to inflate balls. I haven't tested it on the airbed (just tested if it fits it), but it will do it. Good luck