The Delta 4 is one hot new regulator ready to take on all challengers with improved performance, new features, improved styling, and the new FDX-10 First Stage featuring DVT (Dry Valve Technology).

- Diver adjustable inhalation effort
- Patented Dynamic Adjustment automatically maintains inhalation effort throughout the dive
- Adjustable Venturi Switch (A.V.S.) for simple Dive/Pre-Dive Adjustment
- Paired with the new FDX-10 Over-Balanced Diaphragm First Stage featuring Oceanics DVT (Dry Valve Technology)