The Chill-Its 5050M Hydration Pack Mouthpiece is compatible with Chill-Its 5155 and 5156 Hydration Packs offering hygienic hydration with its antimicrobial bite valve for clean and safe drinking. For enhanced protection, a dust cover shields the bite valve from dirt and contaminants when not in use. Designed for durability, this hydration bladder mouthpiece part ensures long-lasting performance even in rugged conditions.