This was super easy to install an an addition to my KitchenAid espresso machine. I use it when I want to add some foam to my espressos. I usually only make one or two cups at a time, so don't want to dump milk into the attachment. Instead, it's easy to take the hose from the attachment straight into the milk carton. This eliminates milk waste and cuts down on the amount of cleaning needing. I would recommend if you frequently want to add water or milk froth to your drinks.