page_title: Diving cylinder
section_title: Capacity
hierarchical_section_title: Diving cylinder / Capacity
caption_attribution_description: English: 12 and 3 litre steel Diving cylinders
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: There are two commonly used conventions for describing the capacity of a diving cylinder. One is based on the internal volume of the cylinder. The other is based on nominal volume of gas stored.
caption: 12-litre and 3-litre steel diving cylinders: Typical Primary and Pony sizes
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