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Upgrade your hydration reservoir's performance with the orange Helix Valve Kit from SOURCE. This bite valve features omnidirectional operation so you won't need to orient it to get a sip, just a gentle bite anywhere will start the flow. The spring ensures that the valve won't leak under the pressure of a full reservoir. A dirt shield is included to keep it clean when not in use. This accessory will work with any reservoir that uses industry standard tubing.