Originally Posted by
Desert Flower
Some Jet A1 nozzles had a flange on them which was supposed to prevent them from being inserted in an Avgas tank opening. But they were a pain in the proverbial, because there were some turbine aircraft tank openings that they didn't fit in properly which necessitated changing the nozzle to the normal one.
DF.
That's possibly a case of "Too much information", DF?