Blowpipe
tube, with valve, connecting bellows and bag
Tube, with valve, connecting outlet tube (of the bellows) and bag.
Garvin, Wilbert: The Irish bagpipes: their construction and maintenance [Belfast 1978, Blackstaff Press]. Foreword by Breandán Breathnach. Kells, 1988 (2), p.2.
Buckley, Ann: Considerations in a stylistic analysis of uilleann piping. In: SIMP VI (Stockholm, 1979), p.120.