Introducing the ALPS Mountaineering Hydration Bite Valve Sheaths 3PK. Have a well used ALPS reservoir that the bite valve has been worn or damaged? These bite valve sheaths are compatible with the standard Reservoir 3.0 bite valve and the Magnetic Bite Valve. FeaturesReplacement bite valve sheaths for ALPS Reservoir 3.0 bite valvesPairs well with Reservoir Cleaning Kit, Magnetic Bite Valve, and Reservoir 3.0