I need a propane fill valve that will work on the tanks.
and I need to figure a way to use water inside the tank as the propane tanks are heavy.
I think just air will work because there's no friction while its hardly moving so a tiny force is enough. Just try it. Fill a tank with air, put it in the bath, open the valve, see if it drifts away.
So you just need to buy a filling valve then you can fill it with air? Come on!!! Go shopping!! I'm sure that'll come in handy for lots of other things too, so it's not wasted money.
I think that I will only use 1 propane tank and some pvc pipe with a valve , and let the pressurized air push the water through a nozzle from 1 pipe into another pipe.
That's going to take ages. Just do it the easiest way! It doesn't have to be powerful, all it has to do is move the length of the system, no matter how slow it is. In fact it doesn't even have to move that far, once you tell me the mass of air and tanks I'll work out a much shorter upper limit on my predicted distance of travel.
