[oil pan 4]

When they work they suck. Unless you are filling up a tiny gas tank like on a chain saw or weedeater.
Then they are just ok.
I had some that were 2 years old on my 5 gallon gas can and 1 gallon 2 stroke gas can.
I was filling up my riding lawn mower with the EPA approved fill spout, seemed to be working fine. Then as the tank became full I allowed the spill prof spout to close as I lifted away from the gas tank and a plastic tab broke and the spring shot the end of the spout off, leaving the open gas tank to spill all over the mower and some on my self.
Fixed that with a "pre1996" gas spout and I'll be sure to only fill it up about 4 to 4.5 gallons.

Then my saw and weed eater gas can it was sitting there looked perfectly fine, lifted it up and tilted it to the fuel tank and the whole spout broke off. Dumped gas all over the weed eater.
I put another EPA approved gas spout on it because it's handy for filling really small tanks like on a chain saw.

Note this didn't happen on the same day. The saw gas can spout broke off earlier this year and the 5 gallon spout flew apart thus weekend.