ZJKC Straight 90 degrees Silicone Bite Valve Hydration Pack Bite Valve With Cover for Camelbak Platypus Mouthpiece Nozzle Cycle Sports Packs Bladder (black, Straight Valve) 0% Imported 0% 2 Styles available - Straight & 90 degrees Manufactured using medical grade silicone Easy to use just bite and sip Fits all brands and types of hydration bladders Features On Off Valve - Stops Leaks when not in Use