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it's a pressure-relief device
You'll be collecting them all in no time
the gasket and o-ring harden with heat cycling and are the most common source of a weeping sight glass
Compak K5/K6/K8 (older models)
since the threads aren't tapped deep enough for one
Rancilio Classe 9 USB Tall 3 Group Volumetric Espresso Machine la-san-marco-grinder-parts/la-san-marco-sm92-97-lk-tk-parts it's a pressure-relief deviceThis is your mid to top range espresso machine. What sets this model apart is that it's built of super tough and durable materials. Its made of aluminum and stainless steel so it's prepared to take a beating from flying pitchers. Built for volume this machine can support the busy barista who's making about 62 drinks an hour. Wowzers! A lovely time saving feature we especially love about the Classe 9 is the programmable automated daily cleaning
