I have a whole load of MOD or MOD 'style' jerry cans that ive acquired over the years, mainly from boot sales.
Theyre all pretty much the same....
...or so you would think!
I have one of those clip on nozzle things, like this -

(i removed the plastic ages ago, as it stops it glugging)
Anyhow, it fits some of the cans perfectly, with no leaking, but others, it either wont clip on to (the cam locking doesn't seem to pass the high point) or it clips on fine, but leaks.
Im thinking this is just the way of things, and that i should flog all the cans i have that dont mate with the spout on ebay, save them getting mixed in all the time.
But...
Do you think its worth trying some other spouts first? I cant think one will fit them all, but might it be worth a go, i wonder?