• NUK Anti-Colic Professional was developed to help prevent babies swallowing air when feeding. A tube in the bottle separates the air and food, which means less air gets into their tummies, while an air valve in the teat ensures that it does not contract when feeding, meaning that your baby can feed without having to let go. Helps prevent air bubbles in liquid. BPA-free. • For hygiene reasons, we can only accept returns if the item is in its original packaging. • Developed to help prevent colic, the NUK Professional Ventilation System combines an air valve in the teat to prevent collapsing and a tube in the bottle that separates the air and food. • Adapter set includes air valve, tube and cleaning brush. • Compatible with NUK Anti-Colic Professional baby bottles and all 300ml NUK First Choice+ baby bottles. Store in cool and dry place Germany