Bite Valve Sheath

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If the rubber sheath gets ripped or torn for any reason and you don't need to replace the whole mouthpiece, the replacement bite valve sheaths are a perfect solution. This 2-pack d urable silicone sheath fits on second generation lunchbox mouthpieces. If your mouthpiece is branded with "TSI" on the side of it, it's first generation which means you'll need the updated mouthpiece instead of these! Show more