This is the Poseidon SE7EN Mouthpiece Rebreather
Closed-circuit to open-circuit in one simple motion
- Mouthpiece is compact and lightweight
- DSV - bubble free diving with low work-of-breathing
- BOV - high-performance open-circuit regulator
- ADV - compensates for counterlung compression
One of the unique components of the Poseidon rebreather is its open circuit/closed circuit switch-able mouthpiece, that incorporates automatic diluent addition (ADV) functionality.