tre5
+1y
The o-ring fitting is a completely different type of fitting than the NPT fitting. The o-ring is a straight thread and needs a grove machined in the female side for the o-ring to sit in, whereas a NPT fitting is a tapered thread and the tighter you turn it, the more it grows...creating the seal. So the simple answer is, no they will not work with the standard NPT fitting.
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As far as holding up on hoppers and dancers goes, I'm sure it would hold up... it just wouldn't perform very well. The reason I say that is most of the hoppers/ dancers will run larger ports, fittings, and hoses. Everything we have is a 3/8" size and hoppers will run up to 1" sizes. They are doing some other stuff as well... piston pumps, large orifice slow downs (or no slow downs at all), 1/2" lines or larger, ect. It's kinda like "fast bags" vs. a normal air bag setup. Some of the parts are the same, just larger.