Optimal Compatibility: Designed to fit most hydration bladders, these bite valve replacements are specifically compatible with Osprey Packs Hydraulics Reservoirs. Their universal design ensures seamless functionality 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 excellent 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 simple with these silicone sheaths. Just remove the old valve and insert the new one—no modifications to your backpack's drinking tube are required, 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 maintain the hygiene and performance of your hydration system over time. 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 keep your hydration system functioning properly. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Sheath (only the listed items included; other products not included) Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.