If you would like to use any pump from a 19 liter (5 gallon) bottle with a 5 liter bottle this is your solution. How to make it work: 1. Print an adapter 2. Take the original lid of 5 liter bottle and make a hole that your pump requires 3. Stick the lid into the adapter 4. Use new 'device' instead of regular lid 5. Congrats!