Filling the bottle.

I have a small 3 liter bottle I’m using for filling my air guns. I only fill from 150-200 bar which only takes a few minutes with the Yong Heng. Even though this isn’t the most efficient set up I do get several useable fills on my guns as the sweet spot seems to be from 180 to 150 bar. Saves on the number of warm up cycles the compressor has to go through. 
I was also able to obtain a used SCBA bottle that has more capacity but I haven’t tried it yet.