CCGG uses three different size cylinders but most of our standards are contained in 30 liter (internal volume) cylinders.
(CCGG; uses; three different size cylinders but most of our standards are contained in 30 liter (internal volume) cylinders) (most of our standards; are contained; in 30 liter)
CCGG most of our standards
uses are contained
three different size cylinders but most of our standards are contained in 30 liter (internal volume) cylinders
in 30 liter