Fole (m)
(with) definite article: elair reservoir: flexible (usually of animal skin), ready for the insertion of stocks
According to Jambrina Leal, also a commonly used abbreviation of Gaita de fole; NB: ➺ homonyms, &c.
Made of sheep or kid (i.e. young goat).
Jambrina Leal, Alberto: Panorama de la gaita de fole en Zamora, Castilla y Leon [sic]. In: Utriculus IX (34), aprile/giugno 2005, p.9.