- Balanced, adjustable downstream valve
- Adjustable inhalation resistance
- Air Control Vane (ACV)
- Compatible with 40% Nitrox
- Bench testing by an authorized Halcyon regulator service technician is recommended prior to use
Breathing underwater should feel natural and that experience you will have with a Halcyon second stage.
With a smooth and steady high flow of gas you can feel comfortable on any dive.
The Halo is a balanced downstream second stage that works perfectly with all Halcyon first stages.
Adjustable inhalation control
ACV setting for additional fine tuning of the breathing resistance.