Thayer valve.

The Bach 42T Stradivarius Trombone with Thayer Valve F Attachment has a more open feel from other trombones. The Bach 42T Thayer valve eliminates restriction from the open wrap tubing of the F attachment.

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Bach 42T Stradivarius Pro Trombone with Thayer Valve Specifications:

• Key: Bb/F
• Bore: .547"
• Leadpipe: Fixed
• Leadpipe Material: Yellow Brass
• Bell: 8.5" one-piece hand-hammered
• Bell Material: Yellow Brass or Gold Brass
• Handslide: Standard or Lightweight
• Handslide Material: Yellow Brass or Nickel Silver (Lightweight)
• Handslide Crook Material: Yellow Brass or Nickel Silver (Lightweight)
• F Attachment Wrap: Open
• F Attachment Valve: Thayer
• Case: zippered Cordura covered wood shell case
• Mouthpiece: Bach 6-1/2A
• Mouthpiece Shank: Large
• Finish: Lacquer