Silver Plate Mouthpiece Adpaters
The manufacturer’s website shows a tuba end outside diameter of 13.5 mm and a mouthpiece end inside diameter of 12.5 mm. My conventional American shank mouthpiece fits about half-way into the adapter, providing me with the ergonomic and tuning benefit I wanted.
I need to use a Wick 3 (small shank) in a JP377 Eb tuba with an American receiver. This adapter fits perfectly, leaving an appropriate length of shank outside the receiver, with no looseness or wobbling.
Don't let the awkward description from the manufacturer fool you - this is an excellent adapter for using a tuba mouthpiece with the smaller 'American'-tapered shank in an instrument with the larger 'European'-sized receiver. The adapter will also insert almost exactly one inch into an American-sized receiver. So if you own such an instrument, this adapter can be used to bring the mouthpiece rim further from the body of the tuba for improved ergonomics.