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“Compatible” describes whether it works. “Required” or “Useful” describes whether you should buy it.
Breville · Part BEA401
Breville documents this standalone 420 ml steaming jug, whose open-vessel design has no machine-specific fit interface.
Safety qualification: exact tier-1/2 manufacturer or certification evidence is linked, with no active conflicting evidence.
Breville · Part BES003
Breville lists the Temp Control Milk Jug as a Barista Express accessory; its open jug has no machine-specific connector.
Safety qualification: exact tier-1/2 manufacturer or certification evidence is linked, with no active conflicting evidence.
Open the evidence, limitations, and model identity for a single accessory.