VALUE PACK: 5-pack replacement bite valve nozzles compatible with Osprey, Nathan & Hydrapak Hydration Reservoirs & Blisters. Replacing bite spouts more often helps prevent dirty tasting water and keeps sipping enjoyable. FOOD GRADE OEM QUALITY: Bite valve sleeves are designed to meet OEM quality. Made from BPA-free, phthalate-free, lead-free, food-grade silicone, they balance softness and stiffness for a comfortable, durable drinking experience. PERFECT FIT AND PERFORMANCE: Each bite pourer provides a precise replacement for your Osprey hydraulic container, Hydrapak hydration bladder, and Nathan water bladder. Not designed for other brands. Delivers fast, smooth water flow, self-seal after every sip, and a leak-proof experience. EASY TO REPLACE: Remove the dirty old mouthpiece (store the colored plastic post) and install the new replacement nozzle in under 30 seconds. USE SCENARIOS: - Hiking with Osprey packs, refresh the mouthpiece for a clean-tasting sip. - Long cycling sessions with Hydrapak bladders, maintain reliable flow and seal. - Endurance runs with Nathan bladders, replace before or during activity for consistent performance.