The invention relates to a device (15) for foaming milk by means of
external suction equipment (35), used as in accessory for espresso
machines or similar domestic appliances. Said device comprises a fixed
part that can be connected to the steam supply conduit (1) of said
machines and an easily interchangeable disposable part (26) containing
all parts that come into contact with the milk. The invention is
characterised in that components of the disposable parts and in some
embodiments of the invention even the entire disposable part consist(s)
of thin-walled plastic tubes of the drinking straw type, which can be
produced in a cost-effective and environmentally friendly manner by
extrusion and subsequent thermoplastic forming. The use of the inventive
device obviates the need for the inconvenient cleaning of conventional
foaming nozzles and eliminates hygiene problems.