Prismo is a pressure-actuated valve designed to be used with the AeroPress Coffee Maker. Prismo allows for a build-up of pressure which creates espresso-style coffee from your AeroPress. Not only can the Prismo be used to achieve a smooth espresso-style coffee, it also acts as a no-drip seal for a full immersion brew. The reusable 70 micron etched filter eliminates the need for paper filters and prevents sediment from passing through to your brew.