Optimal Compatibility: Designed to fit most hydration bladders, these bite valve replacements are compatible with various hydration reservoirs. Their universal design ensures seamless functionality with different types of hydration systems, making them a versatile choice for outdoor enthusiasts. Superior Silicone Quality: Made from high-quality silicone, these bite valves offer exceptional 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. Just remove the old valve and insert the new one directly into the drinking tube without any modifications, allowing for a quick and convenient upgrade. Comprehensive Package: Includes four silicone bite valves, each with inner posts. This quantity supports regular replacement, helping maintain hygiene and performance of your hydration system over time. Versatile Use: These silicone nozzle replacements are designed to fit a wide range of hydration systems, including those with rotatable and on/off features. Ideal for biking, running, hiking, and other outdoor activities where reliable hydration is essential. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement (sheath only). Other items not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.