So far, I am having difficulty finding an air pump not battery operated that I can use to inflate the main section of the chair.  I thought a bicycle tire pump would work, but the design, great though it seems to be, is going to be more difficult to inflate than I anticipated.  I may need to buy a pump just for this chair, although it won't be very expensive.  I really am happy with the design of the chair, and that the back and seat cushions inflate separately (I used my lungs to inflate those).  Perhaps there could be a third rubber filler neck, or would that not be able to handle the air pressure if a large person sits on the chair?  I'm happy that I bought the chair and will be happier when I get it inflated.