2airishuman
Contributor
::shrug:: I have no idea what it is. I wouldn't pump air into it, you do what you want.No, it is literally a pi symbol.
You can throw it away in 2026, since nobody in the US will recertify it.
And forget going to a dive shop for a fill.
Well, if we thought it were a UN/ISO cylinder, those have a 10 year hydro cycle.