This wooden paddle (410003) is replacement accessory for Lelit PL162T Bianca espresso machine and upgrading kit for Mara espresso machines. This wooden paddle helps real time control of flow/pressure within the E61 group. Rotating it, you gradually vary the water flow inside the group until the highest pressure is reached. This way you can manually control every single phase of the coffee extraction to obtain the best possible result in the cup with every type of coffee blend.