Tough silicone bellows designed for thousands of pump cycles, delivering durable performance in demanding use. Consistent extraction over time, helping maintain stable results across multiple uses. Extremely low bean retention during grinding, enabling backtoback grinding with a 20 g portafilter to flush the previous beans. Easy bean changes without needing to flush previous beans, reducing stale beans stuck in the grind chamber. Specifications and attributes Material: silicone Function: bellows for pump action, designed to withstand cycle use Compatibility: intended to standard silicone bellows in compatible espresso equipment; verify fit with your model Size: standard bellows size for common compatible units; confirm compatibility with your setup Performance: minimizes bean retention during grinding to support quick transitions and consistent extractions Use scenarios In a busy cafe with frequent bean rotation: quickly switch between beans between shots without sacrificing extraction quality or wasting time flushing At home for bean experiments: perform backtoback grinds with minimal crosscontamination, enabling faster trial of different roasts and flavors During volume service or events: support rapid shifts between bean types while maintaining reliable pump performance and extraction consistency