3000psi or 4500psi are the two standard fill pressures.
0.68cu is the imperial capacity measurement for 1.1 Litres of volume....that's the capacity of the tank, so you could actually have as follows:
0.8L @ 3000psi
1.1L @ 3000psi
1.5L @ 3000psi
0.8L @ 4500psi
1.1L @ 4500psi
1.5L @ 4500psi
with the american equivelents as listed above
Hope that clarifys it
0.68cu is the imperial capacity measurement for 1.1 Litres of volume....that's the capacity of the tank, so you could actually have as follows:
0.8L @ 3000psi
1.1L @ 3000psi
1.5L @ 3000psi
0.8L @ 4500psi
1.1L @ 4500psi
1.5L @ 4500psi
with the american equivelents as listed above
Hope that clarifys it