So to fill my SCBA tank I get this:
then thread this on it air tight:
and just fill it up right? I have the fill station already, for some odd reason I thought that was all you needed, please tell me if I'm missing something.

CGA 347 SCBA Breathing Air Compressor SCUBA x 1/4" MNPT Adapter | eBay
Commonly used in SCUBA Filling Systems, Paintball Air Systems, SCBA Fire Breathing Apparatus Filling Systems, Cascade Systems, and any high pressure breathing air application requiring connection from CGA347 Nut and Nipple to 1/4" Male NPT Pipe.
www.ebay.com
then thread this on it air tight:

STAINLESS STEEL 1/4" NPT Air Compressor Male Quick Connect Hose Fitting Plug | eBay
Thread: 1/4" Male NPT, MPT. Material: 303 STAINLESS STEEL. Body: 1/4" Plug / Nipple. Part Number: 10-3S/S.
www.ebay.com
and just fill it up right? I have the fill station already, for some odd reason I thought that was all you needed, please tell me if I'm missing something.