funnel wine bottle

I often buy wine in gallon bottles, and it's difficult to pour directly from the large bottle. So, I like to transfer some to a smaller, empty wine bottle.

This funnel has an integrated vent and a splash shield. I've made others and this is the right way to make a funnel, imho. The vent is somewhat difficult to design, but it is worth the effort.
It's amazing how fast you can pour without blocking and overflowing it when there is a good air vent.

The funnel's spout is 0.69 inches (17.5 mm