The Chill-Its 5053 Replacement Mouthpiece is a clean, easy-to-install replacement valve compatible with the Chill-Its 5160 Hydration Pack (sold separately). The mouthpiece features an antimicrobial treatment to help keep the drinking surface cleaner. A twist on/off shutoff controls water flow, while the protective cover helps block dirt and debris. The mouthpiece easily splits into two pieces for thorough cleaning, making maintenance simple by hand or in the dishwasher.</