This design transports lotion from 1 renew bottle to a small travel sized container. This design is used by pumping lotion from the bigger bottle into the small bottle. To use properly push out all the air from the small container and pump untill its gets close to full. If you follow these steps then the lotion won't expolde everywhere. This design makes it so you can keep thoes small containers of lotion instead of spending more money to buy a new one.