Skip to main content

Conn Sousaphone in BBb 40K



Find a Dealer


The 40K 4-Valve Sousaphone is an exciting addition to the legendary line of Conn sousaphones. The addition of the 4th valve creates improved intonation- especially in the lower register. For bands that require a strong lower foundation for their ensemble, the extended lower range of this model allows the player to really crank out the lower notes with ease.


  • Standard heavy-duty bracing
  • 4 Valves
  • Exclusive offset short action pistons
  • Clear lacquer finish
  • No case


  • Key of BBb
  • All Brass
  • .734" Bore
  • 26" Bell
  • Conn 120S Helleberg Mouthpiece

Product Attributes