Legend ACD

 First Stage

* Over-balanced diaphragm.
* Auto-Closure Device (ACD).
* Environmental dry chamber.
* Air Turbo System.
* 2 High-pressure ports and 4 low-pressure ports.
* Black polyurethane coating.

Second Stage

* Pneumatically Balanced.
* Diver-controlled Venturi.
*Adjustment Switch (VAS).
*Built-in heat exchanger.
* Exclusive Comfo-Bite mouthpiece.
*Gold accent ring.