Since buying the ECM a while back I had issues on occasion getting nice silky milk. Worked around it but last couple of days flow seemed poor. After its routine clean I whipped the wand off and stripped it. Basically a bent stainless tube with liner held by fittings. Outlet nozzle connects to a venturi fitting.
The wand gets wiped down and flushed every use and a weekly clean of the nozzle but didn't remove / know about the venturi so didn't dig further.
One of the o rings had been pinched during assembly and finally let go. It blocked the wand at the venturi. Bits were wedged in there so from day one lower flow than design.
Removed the offending debris, sorted a new o ring and refitted and what a difference. Even
@ozzybmx would be impressed at the flow! Silky milky? You bet.