Hydrapak Hydrafusion Insulated Drink Tube BLASTER VALVE - High-flow blaster bite valve self seals after each sip and features a twist on/off bar to prevent leaks when not in use. FLEXIBLE - Non kinking tube designed for easy routing. PLUG-N-PLAY - Universal  in diameter fitting with quick connect system. 100% BPA & PVC FREE - No weird taste, no unnecessary and harmful chemicals. BEYOND LIFETIME WARRANTY: If you experience any issue, well repair or replace the item for free. Whatever it takes to keep your adventure going.