My understanding is thats exactly what the funnel was for. No reason you couldn't use it for oil or water either. On most of these funnels, you also had a threaded fitting halfway up the spout, which allowed you to attach the horsecock to it for filling up the trucks where the neck was hidden by the toolbox.
The 2 gallon POW can fits inside the funnel on the two little metal lips inside the funnel.
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