Cap Storage Hoppers specification should start with the real closure.
Cap storage hoppers improve operator efficiency when a line is using large quantities of closures. The hopper should prevent bridging and should meter caps into the next stage without overloading the bowl, elevator or chute.
For a better buying decision, the useful comparison is not only hopper size or headline speed. It is how the feeder behaves with your closure, how the capper receives the cap and how easy the line is to run after changeover.
The safest specification route is to start with real closures, target output, line photos and the exact point where the cap must be presented. That avoids choosing a feeder on a generic speed figure that does not match the cap or capper.