Package include: 1 piece bite valve replacement, 2 pieces silicone mouthpiece. Material: Our bite valve replacement is mainly made of silicone, safe and reliable quality, comfortable and soft to use, and won't hurt your body, so you can use them with confidence for a long time Keep the water clean: the tube nozzle replacement the bite valve is a built-in bite valve that stays closed when not in use, don't worry about dust or impurities getting into your water or being sucked into your body, so the water can be kept clean at all times Mouthpiece with on or off shut-off valve: easily control the water flow with the yellow lever. Compatible with drinking tubes and bite valves of most hydration bladders. If you've lost or broken yours, you no longer need to replace the entire bladder. Simply attach this nozzle to the drinking hose and mount the mouthpiece. Suitable for most brands of hydration packs: Our backpack reservoirs and bladder accessories can be applied to most brands of hydration bags, flexible enough to fit well on your hydration bladders.