Sage The Knock Box 20Sage The Knock Box 20 Clean workflow for your espresso routine The Sage The Knock Box 20 is the knock box for anyone who wants to keep their espresso routine clean, fast, and professional. Simply tap the portafilter against the rubberized knock barthe puck lands safely in the container, without splashing or messing up your work surface. Designed to complement Sage portafilter machines, it fits perfectly into any home barista station, both visually and