Why dont you just run the PC from a large co2 tank?
I bought a co2 regulator at a welding supply for $35 that fits the big 20 pound tank..
I have one in my shop at workits almost 3 feet high.
I was filling the 20 ounce bottles at sports authourty for 3.50 each.
The big bottle I had to give $80 "rental deposit and $22. to fill
Having fun with my PC......
Keith Pedersen
www.keithpedersen.com