The HF has a yoke inlet on it; you just jack the compressor output onto the HF stack, and attach the HF Outlet to the tank.
The nice thing about this setup is that you can take the HF stack WITH YOU if you do somewhere and have any reason to be less than "trust me" about their gas. They may have a hissy about allowing you to use it, but you CAN (literally) take it with you - its a bit bulky, but is definitely transportable.
I re-did the connections on mine with QDs, so I can put the filler directly on the compressor filter if I want (primarily for friends who paintball; I'm not burning HF time to do THAT for someone!) and also so I can "safe" the system when I'm not using it, as I have a six year old.
She doesn't have the strength to put the QDs together even if she wanted to (which she doesn't), and the HF stack, with the QDs off, is a closed unit (yet still under pressure) and the way I have it set up you can shut off the outlet, bleed down the fill whip, disconnect the inlet and outlet, and its a stand-alone cannister full of gas but with no way to get it out - ergo, no way for someone to get hurt.