Overflow ControlOur dosing funnels are specifically designed to help eliminate the overflow of coffee grinds while dosing into your portafilter. Eliminating overflow helps you reduce mess, waste, and in turn, will result in much more consistent dosing weights. Our 54mm espresso dosing funnels are designed to work specifically with the Breville / Sage 54mm portafilters found on the Barista Express, Barista Pro, Barista Touch, Bambino, Bambino Plus, Infuser and Duo-Temp Pro as well as the 54mm Solis machines.IMPORTANT NOTE: When using machines such as the Breville Barista Express, the portafilter holder (used to hold the portafilter when dosing/grinding) cannot be used while the funnel is installed.