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ECM in Germany markets their grouphead mushroom in stainless steel versus their competitors who make it in brass with chrome plating. Although the stainless accumulates less limescale build up, the little brass nut with the orifice as shown in the picture below is made of brass. We learned of this when a customer dropped off his ECM Germany Technika espresso machine.
Considering that this little brass nut was not in stainless, were we espresso machine duped?
Grouphead mushroom found on ECM Technika espresso machine