Optimal Compatibility: Designed to fit most hydration bladders, these bite valve replacements are compatible with Hydraulics Reservoirs. Their universal design ensures compatibility with various hydration systems. Superior Silicone Quality: Made from high-quality silicone, these bite valves offer durability and elasticity. They are odorless and free from harmful substances, providing a soft, comfortable bite for a safe drinking experience. Effortless Installation: Replacing your hydration pack's bite valve is simple. Remove the worn-out valve and insert the new one without modifying your backpack's drinking tube. Comprehensive Package: Includes four silicone bite valves with inner posts. This quantity supports regular replacement to maintain hygiene and performance. Versatile Use: These silicone nozzle replacements fit a wide range of bite valves, including rotatable and on/off types. Suitable for biking, running, hiking, and other outdoor activities. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Sheath Note: Light reflection and display differences may cause slight color variation. Measurement tolerance is +/- 1–3 cm.