5.5" Nylon Bristle Group Head Brush for the group head of your home or commercial espresso machine. An essential accessory for keeping your group head clean and preventing leaks between the seal of your portafilter and gasket. Espresso coffee grinds can collect on the rubber gasket causing leaks and the inability to build proper pressure for brewing espresso. The angled design and nylon bristles of the speciall designed espresso machine group head brush makes proper cleaning a snap. Use with espresso machine cleaner such as Urnex Cafiza for a thorough cleaning of your screen.