ECM Single Dose Bellows ECM's Single Dose Bellows is an upgrade that modifies ECM's grinders from hopper fed grinding to single dosing. This accessory is compatible with the full range of ECM espresso grinders. To install, simply remove the bean hopper and insert the bellows in its place. The bellows comes in three parts, the stainless base, silicone bellow, and vented stainless steel lid. Fits all ECM and Profitec 54mm and 64mm Grinders