Precision 57mm Non-Welded Group Head Screen - 200 Micron A pressed-membrane shower screen sized for select Rancilio, Promac, and Magister groups, plus certain very early La Pavoni P1/P3/P6 machines. Works best paired with the older nickel-plated dispersion plate rather than the brass type on Rancilio machines. SPECIFICATIONS External diameter: 57 mm Internal diameter: 56 mm Wall height: 2.8 mm Central hole: 5.5 mm Perforation: Ø 3 mm, 98 holes, circular distribution Filtration: 200 micron COMPATIBILITY Fits: Rancilio (not the Silvia, and not with the brass shower plate), Promac, Magister, and very early La Pavoni P1/P3/P6 INSTALLATION Simple DIY swap, but dial in the fit carefully, see Pro Tips below. PRO TIPS Snug the screen screw just tight enough to hold the screen in place, then run water through it and adjust the screen tighter or looser to get the best, most even water distribution across the puck. On Rancilio machines, this screen pairs best with the older nickel-plated dispersion plate, it does not fit well on the newer brass-type plate.