Thank you for viewing. I am selling custom parts due to a change in instruments. This is a custom piston bottom cap. I actually used it for about a year. I felt that the tone became deeper and it became easier to play. By attaching this, you can attach a water pot for the YEP-321. ※ Used on YAMAHA 2: Custom series, and serial numbers #100,001 and later. Please confirm compatibility before purchasing. ※ The following is a product description. --------- This is an original bottom cap made by the popular brass instrument parts manufacturer "buzz". Unlike conventional heavy bottom caps, the weight is not much different from a regular one, but the structure has been changed. By raising the bottom of the bottom cap, the cap and the tube body are designed to fit more firmly together. Because it can efficiently transmit vibrations, there is less loss and it becomes easier to play. --------- ・We are careful to pack the item carefully, considering impact and water damage. ・We basically reuse packing materials, boxes, and bags, so please purchase only if you understand this. ・Returns and refunds are generally not accepted. ・Please understand that this is a USED item. ・The account name in the product image is for preventing resale. (Because it has been resold in the past) #Euphonium #BottomCap #Custom #YAMAHA #SP #Brass