The non spill sippy cups have a special integrated two-setting non spill system:
- Slow (for slower drinkers or thin drinks)
- Fast (for faster drinkers or thick drinks)
This two-setting non spill system can be located on the bottom of the Difrax non spill sippy cup lid. Open the white part of the valve and move the little blue part to the desired setting. The current setting will be displayed once the non spill system has been clicked shut in the lid.