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2. Pony bottle - Wikipedia

   en.wikipedia.org/wiki/Pony_bottle

   A pony bottle or pony cylinder is a small diving cylinder which is fitted with an independent regulator, and is usually carried by a scuba diver as an auxiliary scuba set.In an emergency, such as depletion of the diver's main air supply, it can be used as an alternative air source or bailout bottle to allow a normal ascent in place of a controlled emergency swimming ascent.

3. Gas cylinder - Wikipedia

   en.wikipedia.org/wiki/Gas_cylinder

   ISO 9809-3: Gas Cylinders–Refillable Seamless Steel Gas Cylinders–Design, Construction and Testing–Part 3: Normalized Steel Cylinders; EN ISO 11120 – Gas cylinders. Refillable seamless steel tubes of water capacity between 150 l and 3000 l. Design, construction and testing (ISO 11120:2015) [33] EN 1975 – Transportable gas cylinders.

4. Scuba cylinder valve - Wikipedia

   en.wikipedia.org/wiki/Scuba_cylinder_valve

   A scuba cylinder valve or pillar valve is a high pressure manually operated screw-down shut off valve fitted to the neck of a scuba cylinder to control breathing gas flow to and from the pressure vessel and to provide a connection with the scuba regulator or filling whip. [1]

5. Diving cylinder - Wikipedia

   en.wikipedia.org/wiki/Diving_cylinder

   "Scuba tank" or "diving tank" is more often used colloquially by non-professionals and native speakers of American English. The term " oxygen tank " is commonly used by non-divers; however, this is a misnomer since these cylinders typically contain (compressed atmospheric) breathing air, or an oxygen-enriched air mix .

6. Underwater breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Underwater_breathing_apparatus

   Underwater breathing apparatus can be classified as open circuit, semi-closed circuit, (including gas extenders) or closed circuit (including reclaim systems), based on whether any of the exhaled gas is recycled, and as self-contained or remotely supplied (usually surface-supplied, but also possibly from a lock-out submersible or an underwater habitat), depending on where the source of the ...

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