The portafilter equipped with a one-way pressure valve to ensure even and barista-standard extraction, no matter where you are.
The pressure valve allows for pre-infusion of the puck prior to pulling the shot, ensuring the evenness of extraction and fullness of body.
Start with a medium-fine grind, and adjust it based on your preferences. Ideal pressure is reached when a hissing sound is heard. Alternatively, wait for 5 seconds, and pump about 30 times to get around 50ml of espresso.