Using Stickman to fill SCBA Tank Back Up

Might be a silly question, but I wanted to confirm. You use a male to male on the stickman whip to fill the SCBA tank back up with a compressor, correct? 

I just didn't want to be missing something silly and searches didn't show much. I have a couple of the little 90 cu in tanks and they have fill nipple right on them, so easy... but the SCBA tank is only usable for me with the Stickman on it, but I see nothing about filling the SCBA tank back up with it.

There is the second cascade fill nipple on it, and don't know if that can be used to fill either.

Thanks. 

 
I'm not sure if I am answering your question, but I reconfigured my Bauer compressor for filling tanks and guns. So I made a air distribution block in aluminum to fit a control switch, a pressure relief valve and a male foster fitting identical to the foster fitting on my FX Crown. These male foster fittings are delivered with a check valve so air only flows into the fitting. In my case, I needed the air to flow out of the fitting. This is not a problem because the internal check valve can simply be pushed out of the foster fitting before threading the fitting in place. Just use a correctly sized pin punch and tap it out. If you are careful, it can be re-inserted at any time as well.
 
Not really.. frankly I didn't understand some of that. I am just wondering how I would hook up a Yong Heng compressor with quick disconnect fitting to a Stikman filling station to fill the SCBA tank back up. I assume (very much assuming) that you use a male to male foster fitting on the end of the QD fittings for both the Stikman and the compressor, but thats really my question.