48.9.C 120
I'm stupid
no no i need something like DOT3AL-1800-M0502-TC3ALM-DCEDC-01A11-A25
(e.g this specific tag was made on january in 2011)
i cant see the size of the things on that photo, but only 3.5 oz aluminum tanks and any chrome-moly steel tanks do not have dates on them :(