How do I get air out of this tank?!?!?

I purchased a 90ci tank and I FINALLY received my Ninja regulator that I ordered a month ago. It's a 4500psi regulator limited to 3000psi. They fit together just fine. I can get air into the tank but the fill assembly I purchased awhile ago doesn't work with the regulator. It's like ninja made their own proprietary system. What do I need to buy to get the air out of the tank?
 
When Ninja came out with their "PCP" regulator (3000psi) they made a change to the pin (IIRC) so that someone didn't inadvertently put it on a paintball marker designed for an 850psi output, I haven't seen it in person, but you may just have to purchase their fill assembly

http://www.amazon.com/Ninja-PCP-Fill-Station-Paintball/dp/B00JANV4K8
 
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