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has the co2 tank you bought on e-bay been hydrostatically checked? all co2 tanks need to be checked and verified for safe use every 5 years (or 3... not sure).
5, some places will just swap it out, some places will charge you $20. Brand new cylinders should come with a hydro date on them. EDIT: well, actually, all cylinders will have the hydro date, but new ones should have a current hydro date.
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