Still not sure how it is any different thn a standard keg filler, except you have a pressure gauge attached.
Keg coupler is standard keg filler.
Pressure is relieved from the keg thru sample port on the other side of Tee.
I fill the keg by the lb instead when it is foaming.
It is more precise to my opinion.
Do you have any hidden treasures how do you do your process?