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a 5lb tank is only a couple inches wider and 3" longer and it has a valve-smaller than the 2x 24s. Basically similar size, more run time.
The paintball tanks orings fail all the time- they are latex or something, non buna-n. The adapters leak as well- especially when you do high output and they get really cold
I use the tanks for around the house because if they fail, I can get another or fix the seals. If Im not at home, that standard bottle and regulator works. A paintball tank and a 4' hose works better than pulling a airhose up a ladder.
I have used the 20lb tanks to run impact wrenches and fix tires on the road. So much nicer than trying to swing a wrench in the dark with passing traffic.
If you are a scuba diver and have tanks, buy a old regulator and put a quick connect on one of the high pressure sides. That way when you are on the beach/driving/need air. You can hook up standard tools to work with what you have. Most paintball paces have switched to air, so you can get them refiled there-cheaper than c02
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Taylor, I'll try to find an inexpensive B-Size 5 cu ft tank in aluminum, or the equivalent.
My SCUBA days are over...
I don't want to invest in a large CO2 tank, but we do have a bunch of CO2 fire extinguishers. The cost to refill a paint pall tank is only couple dollars, and is only necessary from a practical standpoint for us, rarely.
We carry the 2 tanks as a backup for either, plus the Viair compressor.
I've collected a bunch of aluminum medical O2 cylinders that are small over the years, but too large to carry..
Right now we have a small qty of 20 and 24 or so ounce paintball tanks, IIRC in either carbon fiber or aluminum.
One has some sort of 'window' on the side so you can see the fill level, I don't understand how it works, or if it is some sort of liquid crystal embedded into the side.
To resolve the O-ring issue, we use protective caps on the paintball cylinders and some of the caps have a groove for spare O-rings. We have some spares in the kit and we don't mount the regulator, of course.
Rat-P, thank you for mentioning the improved O-ring availability, I'll look for some.