The Halcyon Doubles H-50D + Halo Regulator Package delivers exceptional breathing performance, rock-solid reliability, and precise control—making it the ideal configuration for technical divers running manifolded doubles, deep profiles, or cold-water environments. This package includes two Halcyon H-50D First Stages and two Halo Balanced Second Stages, giving you a fully matched primary, backup, and hose-routing system built for demanding dives.

The H-50D’s balanced, environmentally sealed diaphragm design provides consistent airflow across depth, temperature, and tank pressure. With a dry balance chamber, optimized port layout, and high-flow LP options, the H-50D offers superior hose routing and up to 15% more air delivery—perfect for long-hose/backup configurations.
Paired with the Halo’s smooth inhalation effort, adjustable breathing resistance, and Air Control Vane (ACV), this doubles package gives divers a natural, effortless breathing experience throughout the dive.

Package Highlights

Complete doubles regulator setup including two H-50D first stages and two Halo second stages

Ideal for technical long-hose configurations, manifolded doubles, or cold-water diving

Fully balanced and environmentally sealed for consistent performance in harsh conditions

Adjustable breathing effort via Halo’s Diver Inhalation Control and ACV system

High-flow LP ports and dual HP ports for optimal hose routing

Compatible with up to 40% Nitrox

DIN 300-bar connection (yoke adapter optional)

H-50D First Stage – Key Features

Balanced, environmentally sealed diaphragm

Dry balance chamber prevents water intrusion and enhances cold-water reliability

Two HP ports and four LP ports, including high-flow ports

Up to 15% increased air delivery through optimized design

300-bar DIN connection; yoke adapter available

Compatible with up to 40% Nitrox

Recommended bench testing by an authorized Halcyon regulator technician before use

Halo Second Stage – Key Features

Balanced, adjustable downstream valve for smooth, natural breathing

Adjustable inhalation resistance for personalized breathing effort

Air Control Vane (ACV) for enhanced venturi control and reduced free-flow risk

Compatible with up to 40% Nitrox

Rugged and reliable construction suitable for technical environments

Recommended bench testing by an authorized Halcyon technician before use

Who This Package Is Perfect For

Technical divers running manifolded doubles

Divers using long-hose / backup configurations

Cold-water, wreck, cave, and deep divers

Anyone seeking high-performance Halcyon breathing systems

Why Choose Scuba Connection

As a NAUI Professional Development Center with extensive technical diving expertise, Scuba Connection ensures every regulator package is configured, inspected, and optimized for peak performance before it reaches you. Expert advice and post-purchase support are always available.