I have two Oxygen 'J's and one Helium J That I can't see me using for the time being so I'm going to sell them on.
The Oxygen have 30-40 bar in them and the Helium about 90 bar.
Oxygen are 47 litres 232 bar
Helium is 50 litres 250 bar
looking for £75 each for the O2 and £150 for the He...