Photo please
I will add the Fill port is kind of large... it is outside thread (The fill nozzle fits OVER it) I'm not sure why you'd call it female save the hole in the middle... There is a check valve behind it.
There is a three 'Fingered" knob valve beside it (The Visual Overfill Indicator Valve" if the fill tech did not fully tighten that will leak you will Smell Propane if that happens. (You may for a bit even if the valve is properly closed as some propane is vented during filling)
THe other fittings on the tank are smaller
IF you have a gauge on the tank the Fill port is, as I recall Larger. (The other ports smaller).