ninja UP regulator fitting

I just ordered the Ninja High pressure air station

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I have a question on this device I plan on using it to tether my rifle connecting from my rifle to the female foster fitting on the input side is no problem. What do I do to connect my tank to the pictured fitting on the above photo I have no idea what you call it .If any knows what I need and were to get it please get back to me.
 
Just an add on to my original post above. I called the manufacturer and found out that mystery fitting is for connecting direct to one of those tall tanks like what a welder uses. I also found out that it screws into a 1/4” npt thread. I ordered a 1/4”m to 1/8” f bushing and into that I will attach a 1/8” m foster. Then I will just connect my tiger shark tank direct to the regulator. I was able to get the need parts online from the North Shore Compressor Store.