If you need or think you need a funnel like that, I'd find a different fuel source. Personally, I only buy from reputable FBO's and that does not rule out self-serve fuel.
One tip I've always held on to as a professional pilot is that if you cannot read the manufacturer's printing on the fuel hose, don't use the source as that is a primary indication that the fuel system is not being maintained over the long run. Hoses have a life, just like filters.
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