Cylinders are identified according to the gases contained.
The manufacturer or distributor of a breathing mixture other than air shall record the following information on the identification sheet for each cylinder and in the establishment's register:
- the percentage of oxygen analysed and the theoretical composition of the gas mixture ;
- the date of analysis;
- the name of the manufacturer or distributor.
Before diving, the end user completes the identification sheet for each cylinder with the following information:
- the pressure of the gas mixture in the cylinder ;
- the percentage of oxygen analysed and the composition of the mixture;
- the maximum depth at which the mixture can be used;
- the date of the analysis;
- name or initials.

