preinfusion pressure by taking the top off the machine and turning a small valve that is next to that group heads brew boiler. With the La Marzocco, the preinfusion pressure is preset by your water main pressure. It should be possible to put a pressure regulator on the mains pressure to achieve the same result with the La Marzocco. Not only that but the regulator could be easily accessible without having to take the top off the machine.
Has anyone have any experience with these paddle groups?
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