One of the most common questions that arise at the stage of choosing rings is: "How do I know how many servings I have a coffee maker for?" If you bought a coffee maker a long time ago, you may well have forgotten how many cups I have
it is designed for espresso (especially if you prefer cappuccino, Americano or latte coffee). But that's okay! To find out which set you need, simply take out an old sealing ring, measure its outer and inner diameters, and check the table: