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 litre bottle, 3 pumps for the .5 litre bottle and 6 pumps for the 1 litre bottle.The pre-measured pump is easy to operate and easy to clean.It is the perfect Soda Stream accessory.