HydraPak HyraFlex Tube with Comet Valve - Water that tastes good, goes down good. Made with taste-free TPU, the HydraFlex drink tube is designed to keep your water tasting fresh. And because it's non kinking, you receive a steady flow every single time. Lightweight, high flow Comet valve self seals after each sip and can be opened and locked with one hand to prevent leaks. Features Flexible and non-kinking tube Tube designed in the ideal durometer for easy routing Universal 1/4 in diameter fitting with Plug-N-Play connect system 100% BPA & PVC free, wide working temperature range (can be frozen - max temp 140 Degrees Fahrenheit)