Your Osprey Hydraulics hydration system has some cool features, but this one is just makes sense. The Bite Valve is actually a multi-component system, with a silicone nozzle that allows to safely bite on the valve and draw water. Most riders don''t know these are replaceable, and end up chewing on the valve. Osprey offers this convenient 3-Pack of Hydraulics Silicone Bite Valve Nozzles so you can quickly and easily change out a worn nozzle before you hit the trail. You'll immediately appreciate proper function and protection again.