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The Hydrapak Comet Bite Valve Sheath 2-Pack is a pair of replacement silicone sheaths for Hydrapak's Comet bite valve, the mouthpiece on current Hydrapak reservoirs and drink tubes. Hydrapak pitches them for chewers, and as a backup for your emergency kit.
It suits runners and hikers who use a reservoir often enough to bite through the mouthpiece. The durable silicone gives a soft bite, and swapping a worn sheath takes seconds, so the rest of the valve keeps working. Two sheaths per pack means you can fit one now and stash a spare.
These only fit Comet valves, like the Comet Bite Valve on the Velocity Reservoir. Using a Hydrapak soft flask or an older reservoir? You will want the Blaster Bite Valve Sheath 2-Pack.