UNIVERSAL: The PET adapter makes it possible to add carbonic acid to plastic and PET bottles. We recommend bottles up to 0.75L NO MORE DISPOSABLE: Make your contribution to a more sustainable life. Disposable PET bottles are immediately given several lives thanks to our ingenious connector. Longer life cycle = saves resources and reduces CO2 emissions. IN NO TIME AT ALL: The adapter is easily turned onto the desired PET bottle and the bubbling can begin. NO MORE UNNECESSARY BUBBLING: Even small bottles, such as 250 ml or 333 ml plastic bottles, can be easily sprayed with our adapter.