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Replace the drinking tube on your SOURCE hydration reservoir with the gray Helix Tube Kit from the same manufacturer. This kit is complete with a tube, valve, and a quick-release attachment which is compatible with SOURCE's quick connect and quick mate technology. 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.