I was thinking about one of the earlier comments regarding line size and decided to look at what I was using at the time. I have 1/2 to the main regulator and to the water/oil separator, then some type of connector that has a 1/2 NPT to a 3/8" air hose, to the regulator at the gun that is 1/4". I measured the ID of the male 3/8 and 1/4 connectors and they were basically the same (i.e. ~.191").
What size/type fittings are you guys using?
Sorry for all the dumb questions and thanks for the help.