I nabbed a group of regulators on ebay. Most are Cornelius brand, so I know I'm safe there. My concern comes with one secondary regulator that is branded USG (US Gauge) and has a green gauge (see pic below). When I go searching for this online, the green regulator seems to be associated with medical equipment. Is that correct? If so, is it safe to use with beer/soda?
Also, just as a sanity check, does this setup make sense:
I have a primary regulator that will be attached to my 20lb tank. I'll reduce that regulator to soda pressure and use a y to split that line. One side will go to the soda keg, the other will go to the grouping of secondary regulators, further reducing for the three main styles of beer. Considering the regulators came with all different psi gauges (60, 100, 160) I'm going to replace the three low pressure beer gauges with 30psi. Down the road if I plan on having more than one beer of a style then I can split the air after each regulator.
My setup would look something like this: