This is a cool little print that allows you to make soda bottle vortices all day long. All you need are two 2 litter soda bottles to screw onto the ends of the connector and you're ready to go. I'm not sure how different soda bottles are in different countries, but the popular ones in the USA are what I used and work fine. Based on how good your printer is, you might need to use a little extra muscle to tighten the bottles on. It shouldn't, but it may leak a little based on how good your printer is as well. If you want 100% no leak and to keep this thing forever, use your favorite glue to seal things up nice and tight.