Optimal Compatibility: Designed to fit most hydration bladders, these bite valve s are specifically compatible with for Osprey Packs Hydraulics Reservoirs. Their universal design ensures they work seamlessly with various and types of hydration systems, making them a versatile choice for outdoor enthusiasts.Superior Silicone Quality: Crafted from silicone, these bite valve sheaths offer exceptional durability and elasticity. They are completely odorless and free from harmful substances, providing a soft, comfortable bite and ensuring a healthy drinking experience during your outdoor activities.Effortless Installation: Replacing your hydration pack's bite valve is a breeze with these silicone sheaths. Simply remove the worn-out valve and pop in the new one without any need for modifications to your backpack's drinking tube, making it a convenient upgrade for any hydration system.Comprehensive Package: includes four silicone bite valve sheaths, complete with inner posts. This ample quantity allows for regular , helping to maintain the hygiene and functionality of your hydration system over multiple adventures.Versatile Use: These silicone nozzle s are designed to fit a wide range of bite valves, including those that are 360 degrees rotatable and feature on/off functionality. Whether you're biking, running, hiking, or engaging in any other outdoor activity, these sheaths are the perfect for maintaining hydration.Colour:BlueMaterial:SiliconePackage Contents:4Pack x Bite Valve Sheath