The Nifty Soda Pump is designed to work with the Soda Stream syrup bottles. No more measuring, sticky mess, or overflow. 1.5 pumps for .25 liter bottle, 3 pumps for the .5 liter bottle and 6 pumps for the 1 liter bottle. The pre-measured pump is easy to operate and easy to clean. It is the perfect Soda Stream accessory.