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 any modifications to your backpack's drinking tube, making it a convenient upgrade for any hydration system. Comprehensive Package: Includes four silicone bite valve sheaths with inner posts. This quantity allows for regular replacement, helping to maintain the hygiene and functionality of your hydration system over multiple adventures. Versatile Use: These silicone nozzle replacements fit a wide range of bite valves, including 360-degree rotatable and on/off types. Ideal for biking, running, hiking, and other outdoor activities, these sheaths help maintain proper hydration. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Sheath Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement may vary by +/- 1-3 cm.