Optimal Compatibility: Designed to fit most hydration bladders, these replacement bite valves are specifically compatible with Hydraulics Reservoirs for Osprey Packs. Their universal design ensures they work seamlessly with different 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 covers offer exceptional durability and elasticity. They are completely odorless and free of harmful substances, providing a soft, comfortable bite and ensuring a healthy drinking experience during your outdoor activities. Easy Installation: Replacing your hydration pack's bite valve is easy with these silicone covers. Simply remove the worn-out valve and insert the new one without having to make any modifications to your backpack's hydration hose, making it a convenient upgrade for any hydration system. Comprehensive Package: Includes four silicone bite valve covers, complete with inner posts. This ample quantity allows for regular replacement, helping to maintain the hygiene and functionality of your hydration system over multiple adventures. Versatile Use: These silicone mouthpiece replacements are designed to fit a wide range of bite valves, including those that are 360 degrees rotatable and have on/off function. Whether you are cycling, running, hiking or participating in any other outdoor activity, these covers are the perfect replacement to maintain hydration. Color: Blue Material: Silicone Package Contents: 4-Pack x Bite Valve Replacement Covers The above package contents only, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.