Boccaglio (m)
(with) definite article: iltube through which the bag of a mouth-blown bagpipe, &c. is inflated
NB: ➺ homonyms.
Commonly made of cane, sometimes wood, a goat’s horn (though its animal flavour can be annoying), or metal (which may rust and may be more inconvenient).
Gala, Giuseppe Michele: La zampogna in Campania. In: La zampogna: gli aerofoni a sacco in Italia (2005), II, p.11.