I went to a bike Maintenance course that was put on by the local council in Sydney and was shown this tube that would be really useful if i could find out where to get one. I have an ebike and a flat on the wheel with a motor is a pain. If i get a flat which was only twice with the last ebike that i sold last week then i have to take it to the shop to get it replaced. If i had one of these spare i could at least change it while out and stuck far away then get a proper change later. Anyway know what it is really called and where to get one? I did ask the dude that held the course but he didnt know.