https://www.rosehillinstruments.co.uk/p/631/mouthpipe-adaptors/none/cornet-mouthpiece-to-trumpet-adaptor Cornet mouthpiece to trumpet adaptor £ £39.00 631
https://www.rosehillinstruments.co.uk/p/211-1/mouthpipe-adaptors/unbranded/tuba-mouthpipe-extension-lacquer Tuba mouthpipe extension (lacquer) £ £80.00 211-1
https://www.rosehillinstruments.co.uk/p/211-2/mouthpipe-adaptors/unbranded/tuba-mouthpipe-extension-silver Tuba mouthpipe extension (silver) £ £90.00 211-2