The silicone bellows can take tens of thousands of pumps without breaking or cracking, guaranteed. Seamlessly integrates with your Breville Smart Grinder Pro using an engineered locking ring to secure the hopper in place. A rubber O-ring ensures an air-tight seal for optimized purging of your grinder. The hopper is sized to easily accept 22+ gram doses. Includes an "anti-popcorning" weight that simulates a full hopper forcing the beans into the grinder burrs. This prevents "popcorning" and significantly enhances grind consistency and quality down to the last bean. The weight features integrated air channels to accelerate your workflow. There is no need to remove the weight once all beans are ground – simply leave it in the hopper, pump the bellows to purge the grinder, and enjoy your freshest cup yet. Support small business! FusedLine is a family-run company based in Seattle, WA! To install the Single Dose Hopper onto your machine: br br 1. Remove the original hopper from your machine and clean all old beans and grounds from the grinder. A vacuum cleaner works best. It is essential that the grinder inlet is free from all beans and grounds to ensure a secure fit. br br 2. Insert the orange locking ring by aligning the tabs with the slots in your grinder inlet. Ensure that the hopper is not connected to the orange locking ring at this time. Push the locking ring down firmly to ensure it is fully inserted. br br 3. Insert the hopper into the orange locking ring by aligning the tabs with the slots in the locking ring. Press down to ensure the hopper is fully inserted. Next, twist the hopper clockwise until you feel a click and the hopper will not twist any further. Note that this may require some force as the locking mechanism and O-ring seal. Applying an upward force (pull the hopper up) while twisting should make it easier. It is important to ensure the hopper is correctly installed to engage the safety pin that allows the grinder to operate. br br To use the Single Dose Hopper: br br 1. Measure out your dose and dump the beans into the hopper. Tip: the silicone bellows works great to measure and transfer your beans! br br 2. Place the anti-popcorning weight on top of the beans. br br 3. Set the silicone bellows on top of the hopper. br br 4. Press the grinder trigger to begin grinding. br br 5. Once all the beans are ground, pump the bellows to purge the grinder. Note that this works best while the grinder is spinning; restart the grinder if it has stopped. br br 6. Enjoy your freshest cup yet!