This is an extension tube for the 5th slide of the YAMAHA YCB-822S. By attaching the 5th slide extension, you can choose the pitch of the 5th valve from either a 4/3 tone or a 2-tone interval. There are no major scratches or dents, but there are some polishing scratches. Please understand that this is a used item and no claims will be accepted. The following is from the manufacturer's website: ■ About the 5th Auxiliary Slide (YFB-621/YCB-822 only) The YFB-621 and YCB-822 have a 5th auxiliary slide between the 5th slide and the main body. By removing this 5th auxiliary slide, you can change the pitch that drops when the 5th valve is pressed alone as follows: The 5th valve is generally used in combination with the 4th valve, etc., to correct the pitch in the low range, but depending on the mouthpiece you use, there may be some variation in the pitch. ● With the 5th auxiliary slide attached (at the time of delivery) YFB-621: 4/3 tone lower YCB-822: 2 tones lower ● When the 5th auxiliary slide is removed YFB-621: 2/3 tone lower YCB-822: 4/3 tone lower #Tuba #YCB822S #Tuba #5thSlideExtensionTube