Hello divers. I was surfing the web for used tanks I stumbled across these. They are selling for 90 a piece with current hydro and vis as of march 2019. They are LP 72s, but the valves are throwing me off. I believe they are a version of J valve but would like a confirmation on this. I also would like to know if $90 a piece is a good deal for these LP 72 and what specific details I should check or ask about if I would further pursue. Thanks for any help.