Crafty / Mighty Speed Loader by VGoodiEZ
Pretty much a perfect funnel for the purpose.
Must have Mighty accessory! Most useful purchase I've made in a long time. Definitely would recommend
It's opening let's you see the whole bowl so you can see how much is in it without needing to take the funnel off unlike some others I have tried.
Locks into the base to prevent the little bits from falling between the gaskets and the body of the vape, very easy to use