- Patented two-valve purge system
- Patented Comfo-bite mouthpieces, which does not require the user to clench their teeth, eliminate jaw fatigue
- An optional, smaller size Comfo-bite is available
- Comfo-bite mouthpieces are replaceable
- The flex model allows the lower unit to drop away for use with a regulator Also available in a non-flex, standard version
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