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I bought one of those government approved containers. It's impossible to fill it without spilling gas, and I absolutely hate spilling gas. (The nozzle is spring loaded, such that it takes a fair amount of force to open it. Then, when the container is full, it squirts out the top faster than I can react.)

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Those are actually the easy ones to "fix". Either disassemble and pull the spring out, or if it's the push then twist version, just force/ twist the spout past the plastic nub that's supposed to limit how far it twists.

Either will allow you to hold the valve open without force.

Of course a properly sized/ shaped funnel without any spout at all is even easier. Which is basically how the metal safety cans work. Also helps to drill a vent hole on the handle, and use a sheet metal screw as a plug.

We use golf tees as vent plugs. Easier to remove and replace quickly.

I don't play golf. But I have lots of machine screws!

Eh, I didn't think of using a screw as a plug. Brilliant!

There are also pvc caps made that fit perfectly on most spouts and work much better for spout caps, but iirc they aren't standard sch40.

It was surprising to me that such crappy quality manufacturing manages to have such a standard cap dimension.

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