Ranking among the best in the industry is Halcyon’s H75-P first stage. Designed to be at home in any diving environment, a super reliable air balanced flow-through piston ensures consistent air-flow at any tank-pressure or depth. The H75-P has a 360 degree swivel turret cap with two opposing high-pressure ports and five high-flow low pressure ports. This set-up provides you with ultimate flexibility concerning hose routing and, thus, your comfort. You can set up a simple open water system, configure for doubles, sidemount or decompression tanks, or even create a sophisticated rebreather configuration.

The 300 Bar DIN first stage is considered one of the most secure connections on the market. Of course it can be use with a Yoke fitting, when you connect the correct adapter.

Features:
- Air balanced flow-through piston first stage.
- Two HP and five high-flow LP ports.
- Nitrox 40% compatible.
- Oxygen-clean upgrade kits available for the H75-P.

The Halo.

This high quality second stage regulator provides diver adjustable controls for the ultimate in breathing performance.  Halcyon’s Halo second stage offers steadfast reliability, and impeccable performance. Two methods of breathing adjustment make it the top choice for demanding divers. Halcyon first stages are balanced, so the Halo is a perfect fit with either the Halcyon H-75P or Halcyon H-50D first stage.

- Adjustable inhalation control refines breathing effort by way of an easy access control knob; this allows the demanding diver an opportunity to fine-tune the air delivery of the second stage.
- Air Control Vane (ACV) offers a second diver adjustment for the ability to fine-tune breathing. The ACV uses vacuum assist technology to reduce work of breathing and increase diver comfort. This level of refinement is available on all Halcyon second stages.
- ACV in “dive” position gives powerful breathing support while ACV in “Halcyon” position helps prevent free flows; this can be helpful on the surface, when diving in currents, while scootering, or when the Halo is used as a backup regulator.
- Comfort mouthpiece is standard on every second stage to reduce jaw fatigue and mouth irritation. This long lasting mouthpiece requires only a minimum effort to hold comfortably in place.
- In combination with the freedom of head movement provided by Halcyon’s primary long hose, you will enjoy dives free from the jaw fatigue found with certain mouthpieces and/or poorly balanced hose routing.

The Aura

Aura second stage regulators provide a simple, compact design that makes breathing under water feel completely natural. This high quality second stage delivers air in a smooth, dependable fashion. Halcyon’s Aura second stage comes with a single adjustment control and a pre-set inhalation effort that suits most common diving situations. This feature makes it a common selection as a backup regulator. The Aura is an ideal regulator for divers who want a simple, ready-to-dive regulator. It is also a common choice for training systems and rental units.

Air Control Vane (ACV) offers a second diver adjustment, for the ability to fine-tune breathing. The ACV uses vacuum-assist technology to reduce work of breathing and increase diver comfort. This level of refinement is available on all Halcyon second stages.
ACV in “dive” position gives powerful breathing support, while ACV in “Halcyon” position helps prevent free flows. This can be helpful on the surface, when diving in currents, while scootering, or when the Aura is used as a backup regulator.
Comfort mouthpiece is standard on every second stage, to reduce jaw fatigue and mouth irritation. This long lasting mouthpiece requires only a minimum effort to hold comfortably in place. In combination with the freedom of head movement, provided by Halcyon’s primary long hose, you will enjoy dives free from the jaw fatigue common with certain mouthpieces and/or poorly balanced hose routing.
Comes standard with 100cm/ 40" hose.

Classic downstream valve style regulators have an impressive safety record, and are commonly accepted as an extremely reliable design. Part of their reliability is because the downstream valve opens in the same direction as the incoming airflow, and a spring counteracts the force of the incoming air. In this design, a small inhalation is required to overcome the spring tension and open the valve. This spring pressure is adjusted at the factory, and allows easy breathing and consistent performance. Your Authorized Halcyon Service Technician can make any desired adjustments.