Optimal Compatibility: Designed to fit most hydration bladders, these bite valve replacements are specifically compatible with 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 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 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 supports regular replacement, helping maintain the hygiene and performance of your hydration system over time. Versatile Use: These silicone nozzle replacements are designed to fit a wide range of bite valves, including 360-degree rotatable designs and those with on/off functionality. Ideal for biking, running, hiking, and other outdoor activities, they help maintain reliable hydration. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Sheath Only the above package content is included; other items are not part of this product. Note: Light reflection and different display settings may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may vary by +/- 1-3 cm.