This is an exchangeable cap for Xiaomi foam soap dispenser to refill those soap tanks.

After having several problems with the one I found here, I decided to recreate it from scratch in Fusion360. I added .f3d and STEP file in case someone wants to further enhance it.

Now, the sealed plug fits perfectly, its way stronger and prints with just one support under the hook. (Support is not included in the stl. I used tree support from Cura, but on my printer it even prints without any support)

After printing, remove the old tank cap, remove the straw and put the straw into the hole of this new cap.

There is one big protruding block on the tank opening. Snap the cap onto the tank with this block besides the hook. Short turn clockwise will fix this block under the hook.