Well it all depends How you are going to get your Tank filled... Airhog tanks come with a Standard Jubilee 300 DIN valve.
If you are going to a compressor to fill it.. A full sized breathing air quality compressor will have a Correct 300 bar DIN fitting. Other compressors usually have the a Foster QF coupler.. So you will need a Foster nipple to 300 DIN adapter But if you going to get filled at your local fire dept. You will need a CGA(firehouse) to DIN adapter.
You can go to Joe B's website for the adapter you will need!
HOW you're going to fill it should be stated. Then a correct answer can be given. If you have your own compressor you need a DIN 300 fill adapter. Year of manufacture & last hydrotesting date will determine if a shop will even mess with it so please provide that information (pics of tank labels). If you have a compressor you'll need something like this (link) . You'll also need a double Male foster fitting to connect compressor hose to adapter hose.
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Thank you all for the response, just got off the phone with Andrew at topgun. He took care of all my questions and in a few days I should be up and running. Thanks again Matt