Hmm. I pretty much ran into the problem Don described when I unboxed the 210 EXT - the quick disconnect on the welder used a 3/16" hose barb, but the regulator was 1/4" barb. I was just agreeing with Don that tossing a 3/16" barb in the box for the regulator would seem to make sense, so it matches the welder end.

Cheers,
Richard