When an alternate air source is needed, breathing performance and reliability matter. The Atomic Aquatics B2 Titanium Octopus Regulator is a premium safe second engineered to deliver the same smooth, natural breathing performance as the B2 primary second stage.

Unlike basic octopus regulators designed only for occasional emergency use, the B2 Octo is effectively a high-visibility version of the acclaimed Atomic Aquatics B2 second stage. Its titanium construction provides exceptional strength, low weight and outstanding resistance to saltwater corrosion—helping ensure your backup regulator remains ready when it matters most.

Atomic Aquatics’ patented Automatic Flow Control, Titanium Seat Saving Dynamic Orifice and pneumatically balanced design provide dependable airflow across changing depths and cylinder pressures. A black PVD-coated Comfort Swivel allows approximately 30 degrees of movement, reducing hose pull and making air sharing more comfortable.

Finished with a highly visible neon-yellow purge cover and supplied with an extra-long 91cm hose, the B2 Titanium Octopus is an outstanding safe second for divers who refuse to compromise on emergency breathing performance.

Features and Benefits

All-Titanium Construction

The B2 Octopus incorporates lightweight titanium components for exceptional strength and resistance to saltwater corrosion.

Benefit: Provides long-term reliability while reducing the weight and bulk of your regulator system.

Primary-Quality Breathing Performance

The B2 Octo is engineered as a clone of the B2 primary second stage rather than a lower-performance backup regulator.

Benefit: Delivers smooth, familiar breathing during an air-sharing situation, helping both divers remain calmer and more comfortable.

Pneumatically Balanced Second Stage

Its balanced valve and high-flow internal design provide consistent performance across varying depths and cylinder pressures.

Benefit: Makes inhalation feel smooth and natural—even at depth or when tank pressure is getting lower.

AFC Automatic Flow Control

Atomic Aquatics’ patented AFC system automatically manages the Venturi effect as depth changes.

Benefit: Optimises breathing assistance without requiring the diver to continually adjust a separate Venturi lever.

Rapid Adjustment Knob

A soft adjustment control allows the second stage to be manually detuned when required.

Benefit: Helps reduce unwanted free-flow during entries, surface conditions or while the octopus is secured as a backup.

Titanium Seat Saving Dynamic Orifice

The patented dynamic orifice moves away from the low-pressure seat when the regulator is not pressurised, helping prevent the seat from developing a permanent impression during storage.

Benefit: Reduces unnecessary seat wear, maintains crisp regulator tuning and improves long-term reliability.

Patented Comfort Swivel

The black PVD-coated swivel provides approximately 30 degrees of movement between the hose and second stage.

Benefit: Reduces hose pulling, binding and jaw strain while giving the receiving diver greater freedom of movement.

Extra-Long 91cm Hose

The B2 Octopus is supplied with a 36-inch hose for improved positioning and air sharing.

Benefit: Provides additional reach between divers and makes it easier to maintain a safe, controlled position during an emergency ascent.

High-Visibility Neon-Yellow Cover

Bright fluorescent-yellow accents make the alternate air source easy to identify.

Benefit: Allows a buddy to locate the octopus quickly in low light, reduced visibility or a stressful emergency.

Large Flexible Purge Cover

The flexible front cover provides an easy-to-find purge control.

Benefit: Simple to operate underwater, including when wearing thick diving gloves.

Compact Low-Profile Design

A streamlined body and low-profile exhaust deflector help minimise unnecessary bulk.

Benefit: Sits neatly against the diver, stores easily in an octopus holder or BCD pocket and reduces snagging.

Atomic Aquatics B2 Octopus Specifications

Why Choose the Atomic Aquatics B2 Titanium Octopus?

A safe second should inspire the same confidence as your primary regulator. The Atomic Aquatics B2 Octo combines primary-quality airflow, corrosion-resistant titanium construction, excellent hose flexibility and unmistakable visibility in one premium alternate air source.