https://www.rosehillinstruments.co.uk/p/4877/mouthpipe-adaptors/none/tuba-mouthpipe-extension-small-bore Tuba mouthpipe extension (small bore) £ £35.00 4877
https://www.rosehillinstruments.co.uk/p/211-1/mouthpipe-adaptors/unbranded/tuba-mouthpipe-extension-lacquer Tuba mouthpipe extension (lacquer) £ £45.00 211-1
https://www.rosehillinstruments.co.uk/p/211-2/mouthpipe-adaptors/unbranded/tuba-mouthpipe-extension-silver Tuba mouthpipe extension (silver) £ £65.00 211-2