Have you ever gone to fill up your fuel cans and wound up losing the black plastic seal cap that fits above the nozzle when it is inverted in the tank and below the threaded cap? I own a small ranch, and constantly need to use my fuel cans. As such, I lose these little buggers all the time! Now, the cans should seal just fine as long as you leave the nozzle out in the "fill" position rather than stowed away in the "storage" position, but this is not always the case. I can't tell you how many times I went to grab a fuel can that I knew was full of gasoline, just to find out that despite the nozzle being in the fill position, the valve had failed and all of my fuel evaporated out of the can. So, to avoid any further aggravation I reverse engineered the cap, and designed it so that we can all simply print new seals!
- Jim Kott