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Specifications:
First Stage DS4
Dry sealed system for cold water.
No turret.
4 medium pressure ports 3/8 UNF
1 high pressure port 7/16 UNF

Second stage ATX40
* Pneumatically balanced system - reduces breathing effort
* Heat exchanger for cold water diving
* Integrated Venturi Control
* Micro adjuster
* Extremely efficient exhaust valve
* Compact integrated exhaust
* 25% lighter than TX models
* Comfo Bite mouthpiece - for comfort and to reduce jaw fatigue