Lawn mower gas filler cap
thingiverse
Needed a funnel that allowed me to see when the tank was full. I created this funnel to screw on like the fuel cap. To fit my particular Briggs and Stratton engine, I increased the X and Y by 17%. Coated it with spray rubber, (i.e. Flex Seal), which ended up not being a good idea because the gasoline washed it off.
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