Exclusive Helix hydration valve design delivers high performance with minimal bite pressure. New QMT valve tip, offers the convenience of disconnecting the valve so the tube can be easily woven through tight openings. Helix Valve is compatible with Quick Mate Technology (QMT) such as UTA and other Source accessories. Storm valve is a hydration system accessory must-have. With it's high-flow, angled, no-bite, push-pull drinking valve and an integrated shut-off mechanism, you'll feel like you're drinking through a straw.