IMS Precision 55mm Group Head Shower Screen - Gaggia An IMS Precision integrated membrane shower screen, 55 mm diameter with 200 µm filtering capacity, designed for the standard screen size used across Gaggia's commercial and domestic lineup, commercial-grade engineering in a size that also fits many home units. SPECIFICATIONS 55 mm diameter 200 µm filtering capacity, integrated membrane design Full specs at IMS Filtri COMPATIBILITY Fits: Gaggia commercial and domestic machines using a standard 55 mm shower screen INSTALLATION An easy DIY swap for most owners, remove the retaining screw, swap the screen, done in a couple of minutes. PRO TIPS A discolored or unevenly wetting screen is often the real cause of "channeling" complaints that get blamed on grind or technique, this is cheap, five-minute maintenance that's worth doing before you start second-guessing your dial-in. Descale the screen's mounting recess too, not just the screen itself, mineral buildup in the pocket behind the screen can prevent a new screen from seating flush, causing the same uneven-flow symptoms to return.