ZJKJ Silicone Bite Valve Hydration Pack With Cover for Camelbak Platypus Mouthpiece Nozzle Cycle Sports Packs Bladder 1.2 Styles available - Straight & 90 degrees 2.Manufactured using medical grade silicone 3. Easy to use just bite and sip 4.Fits all brands and types of hydration bladders 5.Features On /Off Valve - Stops leaks when not in use