The Profitec E61 Flow Control Device is an innovative accessory designed to give you precise control over the water flow during espresso extraction. Compatible with E61 group heads, this device allows you to manually adjust the flow rate, enabling you to experiment with different profiles and achieve the perfect extraction for each type of coffee. The flow control device is easy to install and use, making it a great addition for baristas who want to take their espresso-making to the next level. With the Profitec E61 Flow Control Device, you can fine-tune your espresso shots for optimal flavor and aroma.