i almost forgot if you do have to have a fueler something like those quick fillers you might want to check this one out i have it on one plane and so far so good its made by sullivan you don't need a special prob just a piece of brass tubing it has a tight spring assembly in it works great had a robart or a dubro and it became an in air fuel dump so i had to replace it a couple of yrs. back and its been holding out fine,would have used a fuel dot but
it was on a bracket bolted to the firewall with a hole in the cowling and a fuel dot just wouldn't fit.
roy