Soap dispenser stopper

Soap dispenser stopper I live in Japan and go to hot springs every week. I often bring my favorite shampoo and body soap with me, but sometimes the dispenser gets pushed when I bring them and the contents come out.So I made this stopper.The stopper can be attached to the nozzle when in use, so there is no need to worry about losing it.The stopper is designed to fit on a shaft 9 mm in diameter and 21 mm in length.