Quote Originally Posted by Max
sorry for my lack of understanding/competance,
Just catch up.
I had tried to find smaller painball bottles but all the shops I looked at only stocked 20oz ones but cleary others are available.
Smallest is 3.5oz (135 grams, volume 180cc), biggest I have seen, and could be called paintball tank was 24 oz (760 grams, 1 liter of volume)
I have been looking at the rules and think I understand what the rules require in a pneumatics system, I see that I will need my presure relief valve, my dump valve but I dont know if I will need a remote isolation valve if I use a standard paintball bottle?
I repeat. Paintball bottles can come standard with an on/off valve, not a pin valve. It's just what you buy.

With a pin valve you need an isolation valve, with an on/off, you don't.