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 hydration systems, making them a versatile choice for outdoor enthusiasts. Superior Silicone Quality: Made from high-quality silicone, these bite valves offer excellent 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. Just remove the old valve and insert the new one directly into the drinking tube without any modifications required, allowing for quick and convenient maintenance. Comprehensive Package: Includes four silicone bite valves, each with inner posts. This set allows for regular replacement, helping maintain optimal performance of your hydration system over time. Versatile Use: These silicone nozzle replacements are designed to fit a wide range of hydration bladder bite valves, including 360-degree rotatable and on/off styles. Ideal for biking, running, hiking, and other outdoor activities, they provide a reliable solution for staying hydrated. Color: Blue Material: Silicone Package Contents: 4 x Bite Valve Replacement Sheath Only the items listed above are included; other accessories are not included. Note: Lighting effects and monitor settings may cause slight variations in color appearance between the image and the actual item. Size may vary by +/- 1-3 cm.