Question	Hi, I want to buy two pieces for the backup air source. Question: What is thread on the regulator? that should (adapter - what?) for filling the cylinder with air? Maybe you know where to buy lightweight composite cylinders 3-4 liters? Vladimir.
Answer	For backup air source, you can get this one. http://seavenger.com/auxilair-supply-emergency-air-source-spare-pony-tank-p-1038.html

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