[Alan Brinton]

Hi, TequilaKez. The actual tube may be available on eBay. Search for Suzuki Melodion Mouthpiece, and scroll down the list of items.

But melodica extension tubes are almost all the same in diameter, though they may differ in length or color. What’s different are the fittings on the end that plugs into the melodica. So if you still have that fitting, any replacement tube (for example a cheap one on Amazon.com) will work. There are some differences in flexibility. The original black tubes on some Suzuki and Hammond models are especially nice. eBay is likely the cheaper source, but you can also try searching at Rakuten, the Japanese buying service.

If all else fails, let me know and I’ll try to find one for you.