The E61 Flow Control Device, a joint project by Whole Latte Love and ECM, provides you with the ability to fine-tune the water flow within your brew group, empowering you to personally craft the perfect extraction profile. This specialized component consists of a durable stainless steel needle valve, granting you the freedom to regulate the water flow precisely. With variable flow control, you can extend the pre-infusion phase, ensuring a consistent and thorough saturation, resulting in an impeccable extraction for your espresso.