This mouthpiece for the hydration bladder has a cylindrical shape and the mechanism easily delivers the liquid from the hydration bladder to you. The Helix Valve does not leak even under pressure or with prolonged use.
The Deuter Helix bite valve features a 360 degree valve with soft bite, eliminating the need for a specific mouth orientation. The return spring mechanism is leak-proof even under pressure. Can be used with all Source drinking systems.