I want to correct what I posted above, I just went out to the garage and looked at almost 100 nozzles that I have hanging on the rafters of the garage.
I found only one flex that wasn't soldered.
And I found only one solid end that was soldered.
God knows how many nozzle companies there were and what they decided to to any given day.
If your nozzle has a soldered end you need to replace it with a soldered end, same with the threaded ends.
Author, Gas Pump Identfication books 1st & 2nd Editions & Air Meter Identification books
We rebuild ECO air meters and sell parts.