Optimal Compatibility: Designed to fit most hydration bladders, these bite valve replacements are compatible with Osprey Packs Hydraulics Reservoirs. Their universal design ensures they work seamlessly with various brands and types of hydration systems, making them a versatile choice for outdoor enthusiasts. Superior Silicone Quality: Made from high-quality silicone, these bite valve sheaths offer exceptional durability and elasticity. They are odorless and free from harmful substances, providing a soft, comfortable bite and ensuring a healthy drinking experience during outdoor activities. Effortless Installation: Replacing your hydration pack's bite valve is easy with these silicone sheaths. Simply remove the old valve and insert the new one without modifying your backpack's drinking tube, allowing for a convenient upgrade. Comprehensive Package: Includes four silicone bite valve sheaths with inner posts. This quantity allows for regular replacement, helping maintain the hygiene and functionality of your hydration system over time. Versatile Use: These silicone nozzle replacements fit a wide range of bite valves, including rotatable models with on/off functionality. Ideal for biking, running, hiking, and other outdoor activities, these sheaths help maintain reliable hydration. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Sheath Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.