First degree:

Ultra-balanced for superior performance.
Compact, environmentally isolated diaphragm system.
Angled HP ports for optimal hose routing and transmitter mounting.
Rotating dome with medium pressure openings in parallel direction for improved hose orientation.
Compatible with Nitrox/Oxygen.

Second degree:

High-performance pneumatically balanced lever cylinder.
Large, dive-friendly self-flushing controllable purge button.
The front cover with molded elastomer bumpers includes a molded chrome-plated brass plate, improving the durability of the search valve.
Large protective elastomer bumpers on the sides and top to protect the spare valve from bumps and scratches in the most vulnerable areas.
Reversible second stage for left or right gas supply.
Durable, satin chrome.
Compatible with Nitrox/Oxygen.