[medicdiver]

Don't know if this is the right place for this question, but I'm sure someone will move it if it's not!!

I have access to Oxygen contained in BOC HX cylinders (the new lightweight F size, 10 ltr WC, holds 2300 ltrs O2), the regulator itself is self-contained within the head of the cylinder, but there is a re-charging point on one of the sides under a flap, (that is for use by BOC I presume?). It's not a normal bullnose thread as I expected but don't know what the thread size is. I want to get an adapter HX to DIN to use a decanting whip to fill 3ltr AP cylinders, but don't know what the size is, any ideas please?

Also, just a thought, would this point be a non-return valve, I know gas goes in at this point, but would it come out?

Regards

John