A nifty little trick with the type b's to avoid the caps wearing out is to just fill directly. I don't mean with a syringe. If you look at the hole on the type b, it is almost a perfect match for most juice bottles. I just put the tip of the juice bottle to the hole of the tank cap, and squeeze in the juice, pop the tank back on the atty and go. A lot of the leaking issues are with the plastic caps getting worn from taking em' off /on, and this is working aces over here.