Nice combination: the package contains 8 pieces mouthpieces and 2 pieces shutoff valves with 2 o-rings, nice combination to meet your long-term use; The mouthpieces are with vivid color to be noted easily, enhance the joy of use Easy to operate: the shut off valve with switch is suitable for most products; It can work for hydration packs, bite valve and so on; The yellow switch allows easy switching of water flow, what you need to do is simply connecting the suction nozzle to the hose and make it work normally; The O ring is just for protection to make it work well and save water Durable to use: made of quality silicone, the products are reliable and durable to use, not easy to crack and fade, making your outdoor travel more comfortable; And the size of the bite valve is suitable for most brands products Considerate structure design: with one-piece structure and good sealing, there will be no water leakage, so you can use it with peace of mind, no need to worry about store resources when doing sports outdoors Provide nice experience: with quality material and good performance, the bite valve replacement set can be applied as a nice gift for your family members or friends who needed, providing them with practical use experience Features Adequate quantity: 8 Mouthpieces combined with 2 bite valves can serve you for a long time. You can also give the set as a gift to your friends, and go outdoor activities with them. Simple to use: The shut-off valve with switch is suitable for most products. The yellow switch allows easy switching of water flow, what you need to do is simply connecting the suction nozzle to the hose and make it work normally. The O-ring is just for protection to make it work well and save water. Specification: Material: silicone Color: as picture shows Size: as shown in pictures Package include: 8 x Bite valve replacement mouthpieces 2 x Shutoff valves 2 x Tube o-rings Note: Due to the different monitor and light effect, the actual color may be a little different from the pictures. Since the size above is measured by hand, the size of the actual item you received could be slight different from the size above.