Damselfish
Contributor
It doesn't matter that he did plenty of dives with it a couple years ago. Now is different, over the past couple years more and more places have stopped filling them.I think I might have a problem with the red tank the alloy is 6351. But he stated that he did plenty of dive with it without any problem.
Is the black tank much newer or same general vintage - what year was it made? Even if it's not 6351, some shops have arbitrary cutoffs to simplify things for themselves such as "nothing before 1990."