Simply Twist The Dispenser Onto The Top Of A Plastic 2 Litre Or 1 Litre Bottle, And Then Invert The Bottle To Allow The Content To Flow Into The Glass. This Device Keeps Drinks Carbonated, With Its Full Taste And Flavor Intact. The Fizz Of Your Soda Drink Will Last Up Until The Last Drop. The Fizz Saver Is Great For Home And Office Use, Camping And Picnic Activities, And Just Any Event And Occasion In Need Of Cool And Tasteful Refreshments.