page_title: Diving cylinder
section_title: European Union
hierarchical_section_title: Diving cylinder / Surface finish, colour-coding and labeling / European Union
caption_attribution_description: English: This diving cylinder is in oxygen service and contains nitrox. It is marked with maximum operating depth of 28 metres and oxygen percentage of 36%.
context_page_description: A diving cylinder, scuba tank or diving tank is a gas cylinder used to store and transport the high pressure breathing gas required by a scuba set. It may also be used for surface-supplied diving or as decompression gas or an emergency gas supply for surface supplied diving or scuba. Cylinders provide gas to the diver through the demand valve of a diving regulator or the breathing loop of a diving rebreather.
  Diving cylinders are usually manufactured from aluminium or steel alloys, and are normally fitted with one of two common types of cylinder valve for filling and connection to the regulator. Other accessories such as manifolds, cylinder bands, protective nets and boots and carrying handles may be provided. Various configurations of harness may be used to carry the cylinder or cylinders while diving, depending on the application. Cylinders used for scuba typically have an internal volume of between 3 and 18 litres and a maximum working pressure rating from 184 to 300 bars.
context_section_description: In the European Union gas cylinders may be colour-coded according to EN 1098-3. In the UK this standard is optional. The "shoulder" is the domed top of the cylinder between the parallel section and the pillar valve. For mixed gases, the colours can be either bands or "quarters".
  Air has either a white (RAL 9010) top and black (RAL 9005) band on the shoulder, or white (RAL 9010) and black (RAL 9005) "quartered" shoulders.
  Heliox has either a white (RAL 9010) top and brown (RAL 8008) band on the shoulder, or white (RAL 9010) and brown (RAL 8008) "quartered" shoulders.
  Nitrox, like Air, has either a white (RAL 9010) top and black (RAL 9005) band on the shoulder, or white (RAL 9010) and black (RAL 9005) "quartered" shoulders.
  Pure oxygen has a white shoulder (RAL 9010).
  Pure helium has a brown shoulder (RAL 9008).
  Trimix has a white, black and brown segmented shoulder.
  These breathing gas cylinders must also be labeled with their contents. The label should state the type of breathing gas contained by the cylinder.
caption: Nitrox contents and hazard label used in the UK. The diver has added a temporary maximum operating depth (MOD) indication for easy reference.
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