We know that CO2 is measured by weight that is why the capsules are called 12 grm The guy was worried about pressure which is a safety aspect where weight is not. My TAU cylinder holds about 120 grm and the FWB cylinders 40 grm. That is how I know they have filled after transfer. Lawrie makes his own 12 grm CO2 rechargeable cylinders. I think the air ones are a waste of time due to number of shots available.

Baz