On Dec 4, 5:52*pm, worker bee wrote:
For reasons explained elsewhere, I would love to replace the 'spout' of
about ten Blitz five-gallon plastic portable gasoline containers with a
simple gas cap.

I called Blitz, who does not sell an alternative gas can spout - nor
would they answer this question.

Do you know what 'threads' these cans use and what 'might' be used to
replace the caps that would still handle the 22psi vapor pressure of
gasoline & remain air & water tight?

the same threads in briggs and stratton lawnmower engines. I know
because i have swapped them by mistake in the past.

take a empty can and give it a try......

lawnmower gas caps seal well but have a vent for overpressure events