To have it filled at the fire station, you need to get this adapter...
The end on the right is a female foster that connects to the male foster on your tank. The other end on the left is a CGA347 male adapter that firemen use to fill their SCBA tanks.
This is the female end used to fill the their SCBA tanks which connects to the adapter pictured above.
This is the valve on a SCBA tank which has the same threads as the adapter pictured on the top.