Tabris17, another thing if the regualtor is swapped out, it's a 4500psi tank. I don't know if any 500o psi regs exist.
My advice. if you can fill it to 5000psi, keep it, and re hydro it. If no 5000psi available. sell it to someone who can use a 5000psi tank. get a newer tank with a 4500psi reg.
I'm out. 1-28-2013