I have these on all my "pre-2009"

cans which already have a filter/flame arrestor built in:
View attachment 780249
They work great no leaks, good flow rate, and are available for just about any model can.
But oh my they are just TERRIBLE for the environment by having the "potential" for me to leave the spout cap off of my leak free can and having the gas evaporate into the atmosphere. The new auto shut off models are SOOO much better by halving the flow rate and 100% guaranteeing that you spill gas/diesel all over yourself, the floor, and your hot equipment which then subsequently evaporates into the atmosphere, drastically increases chances of a fire and/or a slipping accident, and toxic fuel exposure.
Stepping down from my soapbox now...