A “bottomless” or naked portafilter has had the spout and base removed this enables full view of the extraction as it passes through the filter basket.
The quality of the extraction can be observed and the texture of the crema and then adjusted accordingly. It is also maintained by many fans of the naked portafilter that it allows the extraction to form better as there is less contact with metal.
This filterholder has 57mm group head and will fit the following;
BRASILIA – ONLY GRADISCA MODEL
FUTURMAT / MAIRALI