Thank you so much for the replies. The 50 foot tubing is attached to the large compressor or whatever it is called. That is what I use in the house. The tank ones will only be when I go out. I would sure like the small one but everyone knows how tight money is, so I'll have to make do with what I have. I will be talking with some people and see if someone comes up with an idea about making something to hold the tank to the wheelchair. I'm just running so many things through my mind it's getting more cluttered than usual. I really appreciate everyone replying to this. It helps just to know you replied. Blessings to all. Kathryn