Abbottarello (m)
(with) definite article: il: l’tube through which the bag of a mouth-blown bagpipe, &c. is inflated
Indubitably related to "abbottarsi" [to get stuffed]; Upper Aniene valley; Usually it was made, in 1 piece, by the pipers themselves.
Tucci, Roberta: La zampogna zoppa dell’alta valle dell’Aniene: in ricordo di Cecco Splendori. In: La zampogna: gli aerofoni a sacco in Italia (2005), I, p.93.