This replacement bite valve nozzles for Osprey hydraulic reservoirs, Hydrapak hydration bladders & Nathan water bladders is an incredible value. No more dirty bite valves leaving a bad taste in your mouth - our value pack allows you to replace your bite piece more frequently for a more enjoyable experience. We have designed our food-grade quality bite valve nozzles to meet OEM quality, based on in-house testing. Made from BPA-free, phthalate-free, lead-free, food-grade silicone, our bite nozzles have the perfect balance of softness and rigidity to give you a great drinking experience and hold up to extended use. Each one of our bite sheaths provides a perfect replacement for your hydration reservoir - not designed to be compatible with other brands of hydration bladders. As with the OEM part, it will provide fast, smooth water flow, a self-seal after each sip and a leak-free experience. To Simply remove the dirty old nozzle (along with the colored plastic post) and install it with a new replacement nozzle. Quick and easy - replace it in under 30 seconds. Please note: This is an aftermarket replacement product. We have no affiliation with or endorsement from any of the manufacturers mentioned above