Not too bad. It would get hot there, when ever you push air thru a small opening, then into a bigger pipe, it creates heat. Because you are compressing it...
hmm so the outlet from my little tank is 3/4 npt as well, so with that in mind, think itd be better to just run a straight 3/4 npt to the bigger tank? Seems to me that going from 3/4 to 1.5 back to 3/4 would be kind of pointless?