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. Simply remove the worn-out valve and insert the new one without any need for modifications to your backpack's drinking tube, making it a convenient upgrade for any hydration system. Comprehensive Package: Includes four silicone bite valves, complete with inner posts. This quantity allows for regular replacement, helping to maintain the performance and functionality of your hydration system over multiple adventures. 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 are a reliable replacement solution for staying hydrated. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Sheath Only the above package content is included; other products are not included. 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.