Hydrogen filling stations for cars


There are several hydrogen automobile filling stations about an hour
north of me. I have seen a video on line how to fill your car.
The video says there a special nozzle that senses the tank and also
seals around the fill pipe. I am wondering if there is anyway to buy
a smaller tank (maybe a propose tank and empty it) and buy just and
amount of hydrogen I need and fill my balloon from it?


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