Optimal Compatibility: Designed to fit most hydration bladders, these bite valve replacements are specifically compatible with Packs Hydraulics Reservoirs. Their universal design ensures seamless functionality with various 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 with these silicone valves. Remove the old valve and insert the new one without any modifications to your backpack's drinking tube, 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 the performance and hygiene of your hydration system over time. Versatile Use: These silicone nozzle replacements are designed to fit a wide range of bite valves, including 360-degree rotatable and on/off styles. Ideal for biking, running, hiking, and other outdoor activities, these valves help maintain reliable 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 vary slightly from the actual product. Measurement may vary by +/- 1-3 cm.