Californian version of Worthington horizontal cylinders

[klubko]

Hi,
I'm hoping someone here could help me. I bought two 10lb alum. horizontal cylinders from WestMarine not knowing that they would be what someone explained to me as a Californian version, with two valves, the central valve only one way and the second (bigger) valve for filling. As I am out of the US I have very difficult time filling those.
Apparently I could either replace the central one way valve by the "normal" two way valve, which I could easily fill everywhere or I could get male part for the filling valve. Any experience with these cylinders? Probably getting the fitting for the filling valve would be much easier as I wouldn't have to mess with the main valve. But can I easily fill through the filling valve without other equipment?
I was trying to locate the fitting for the filling valve, but can't find it anywhere. Any suggestions?
Many thanks
Petr