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 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 durability and elasticity. They are odorless and free from harmful substances, providing a soft, comfortable bite and ensuring a safe 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 quick and convenient upgrade. Comprehensive Package: Includes four silicone bite valve sheaths with inner posts. This quantity supports regular replacement, helping maintain hygiene and performance over multiple uses. Versatile Use: These silicone nozzle replacements fit a wide range of bite valves, including rotatable and on/off styles. 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 (only the items listed are included). Note: Lighting and display differences may cause slight color variations. Measurement may vary by +/- 1-3 cm.