Fangrui Product Details Premium Silicone Bite Valve : Crafted From High-quality Silicone, These Bite Valve Offer Exceptional Durability And Elasticity. Free From Odors And Harmful Substances, They A Soft Bite For Easy Sipping And Healthier Hydration During Your Outdoor Activities. Comprehensive Set: Each Package Includes Six Silicone Bite Valve , Complete With An Inner Post. This Ample Quantity Allows For Regular , Helping You Maintain Optimal Functionality Of Your Hydration System Over Time. Effortless Installation: Replacing Your Bite Valve Is A Breeze With These . Simply Detach The Old Valve And Insert The New Your Hydration Packs Drinking Tube-no Modifications Needed. Enjoy A Hassle-free Setup To Continue Your Adventures. Universal Fit For Hydration Systems: Designed To Fit A Wide Range Of Hydration Bladders And Reservoirs, These Silicone Nozzles Are Compatible With Most And Types, Including 360-degree Rotatable And On/off Bite Valves. Ideal For Biking, Running, Hiking, And More. Enhanced Outdoor Hydra