TheMara X Flow Control Kit allows you to manually adjust the water flow in your E61 brew group to profile your extractions. This custom component is a stainless steel needle valve, which allows the user to vary the amount of water flowing through the group. Variable flow control allows for lengthy pre-infusion for more even saturation and extraction of your espresso.
The flow control device is made from stainless steel to resist corrosion. The pressure gauge mounted on the front of the group reflects the resulting changes in pressure.