3 Sizes Combination: Designed with 3 sizes of mouthpieces connected together, it is respectively in small, medium and large size mouth. The diameter of Small is 0.27 inch7mm; The diameter of Medium is 0.66 inch16.7mm; The diameter of Large is 0.85 inch21.5 mm. High Quality Material: Made of plastic & keep it sturdy for longterm use. Package Includes: 1 set of replacement nozzles, 3 different sizes nozzles connected together. Multifunctional: Perfect for different types of pumps, helps you inflate swimming rings, Partial Air Mattress, Air Mattress, Inflatable Pool Sofa, Camping Inflatable Pillows, Pool Toy, Balloons, Yoga Balls and more, a great tool accessory for outdoor activities. Easy to Install: Choose the right size nozzle accordingly and install it on the air pump, and then inflate the target object, the small size is suitable for small toys, medium and large size is suitable for swimming pool, boat, inflatable bed.