Universal Compatibity: It is compatible with 51mm, 54mm and 58mm portafilter, include single spout and double spout portafilter, it is universal portafilter tamping station. --BENEFITS OF USING A BOTTOMLESS PORTAFILTER: This naked bottomless portafilter gives an unobstructed view of your extraction, helping you to see if any mistakes right away, allow you to monitor your shots.
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