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The CamelBak Ergo HydroLock is a replacement on-off switch for select CamelBak hydration reservoirs. It allows you to shut off and seal the water flow tube completely and securely when the water is not needed and should be preserved. On one end, the switch features a hose barb for securely connecting it to the PowerFlow hose of your hydration reservoir. The other end is smooth to allow you to slide it on to compatible Big Bite Valves.