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, 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 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. Simply remove the worn-out valve and insert the new one without any modifications to your backpack's drinking tube, making it a convenient upgrade for any hydration system. Comprehensive Package: Includes four silicone bite valves, each with inner posts. This quantity supports regular replacement, helping maintain hygiene and functionality across multiple adventures. Versatile Use: These silicone nozzle replacements fit a wide range of bite valves, including rotatable and on/off models. Ideal for biking, running, hiking, and other outdoor activities. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Note: Light reflection and display settings may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 cm.