The ECM E61 Flow Control Device allows you to take full control over the flow rate during espresso extraction. This device is designed to fit ECM E61 group machines and is perfect for experimenting with different extraction profiles. By adjusting the flow rate, you can influence the flavor, body, and aroma of your espresso, giving you the flexibility to create the perfect shot. Easy to install and use, this flow control device is a must-have for baristas who want to take their espresso-making to the next level.