No Knock, No Mess, No Fuss. Quietly releases your espresso coffee puck. Fits 58mm Breville portafilters. An automatically activated suction cup creates a rapid vacuum which quietly releases the espresso coffee puck from the portafilter in one swift action. A quick release lid enables fast puck disposal, combined with a dishwasher safe (top shelf only) Tritan container, making clean up simple and easy.