It has four cylinders and four pistons respectively. The fourth piston is dissociated from the central piston box, serving as an aid to the lower notes, and is activated by the left hand. The nozzle is removable.
Nozzles for mouthpiece
Custódio Cardoso Pereira & Cª
Portugal, Rua do Carmo, 13 – Lisbon, post. 1861
Recording in the bell: C C Pereira & Cª / R. Do Carmo, 13 / Lisboa
System: 3 pistons + 1 piston (auxiliary)
C = 56,4 cm
Ø2 = 24,6 cm