For CO2 cartridges I have a trigger inflator which allows me to govern the flow of gas. I also have a screw on and push down inflator which is small, compact-- not much bigger than an presta/schraeder adaptor. Both work well enough, but I like controlling the flow....allows me to check for proper tube seating to avoid the balloon-and-then-shotgun-sound of a tube squirting out while pumping.