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.
 
 
The H-50D is a high performance diaphragm first stage, fully sealed and built for harsh conditions.
Diaphragm first stages are traditionally popular with cold water divers as no cold water comes in contact with inner parts.
Balanced, environmetally sealed diaphragm
Four low pressure ports
Two opposing high pressure ports.
Nitrox 40% compatible from start
Possible to upgrade to fully oxygen clean.