Chris,
The abbreviation, "NPT" stands for National Pipe Thread and it is the standard for pipe fittings in the U.S as you probably already know.
That fitting you are showing is a 1/4" NPT I believe as that is pretty much the standard size used on Badger, Paasche, and other air hoses where they connect to the compressor. Although they are called, "1/4" they are much larger than that as the NPT system is odd as are most thread standards for pipe threads. Who thinks these things up anyhow?
![Confused [%-)]](/FSM/CS/emoticons/icon_smile_perplexed.gif)
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon