MechPort 3 Pack Valve Guide 15x18mm and 4.5x5.5mm Compatible with Yamaha Jupiter Besson Bach Flugelhorn Baritone

- Broad Compatibility: Compatible with Yamaha flugelhorn and baritone models; Compatible with Jupiter flugelhorn and baritone models; Compatible with Besson flugelhorn and baritone models; Compatible with Bach flugelhorn and baritone models. Please confirm 15x18mm and 4.5x5.5mm sizing before purchase. - Smoother Valve Action: Plastic guides help center piston travel for accurate port alignment, reducing metal contact and minimizing noise during practice, rehearsal, and performance. - Two Common Sizes: Includes 15x18mm and 4.5x5.5mm pieces to match frequent housing styles; measure your existing guide or consult a technician to select the best fit. - Reliable Playing Feel: Supports consistent response for indoor concerts, marching practice, lessons, and studio sessions on flugelhorn or baritone. - Easy Swap: Direct replacement during routine cleaning or rebuild with basic tools; suitable for school band rooms, home practice, outdoor parades, and ensemble rehearsals.