Popping strap
pad, tied to the thigh, providing an airtight seal (Uilleann pipes)
Pad, tied to the thigh, above the left knee; Providing an airtight seal it enables the piper to stop the chanter for staccato playing; Some manufacturers prefer a Gravity valve on the bottom of the chanter.
Made of leather.
Garvin, Wilbert: The Irish bagpipes: their construction and maintenance [Belfast 1978, Blackstaff Press]. Foreword by Breandán Breathnach. Kells, 1988 (2), p.16.
Buckley, Ann: Considerations in a stylistic analysis of uilleann piping. In: SIMP VI (Stockholm, 1979), p.121.