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: Crafted from high-quality silicone, these bite valves offer exceptional durability and elasticity. They are completely 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 simple with these silicone valves. Remove the worn-out valve and insert the new one without any need for modifications to your backpack's drinking tube, allowing for a convenient upgrade. Comprehensive Package: Includes four silicone bite valves, each with inner posts. This quantity allows for regular replacement, helping to maintain the performance and functionality of your hydration system over multiple uses. 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 appear slightly different from the real thing. Measurement may vary by +/- 1-3 cm.