AlphaHybrids
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Sodastream CO2 bottles and their generic equivalents are DOT 3AL. Been meaning to write that down in one of these threads, thanks for the reminder.
https://www.catalinacylinders.com/markets/small-high-pressure-cylinders/
The 9001, 9002, and 9003 sizes are great for 54mm hybrids, as they are 2" OD.
Edward