Atomic Aquatics B2 Regulator

At a glance

The B2 pairs a balanced diaphragm first stage with a balanced pneumatic second stage, weighs about 1.2 kg and is rated to 60 m. The first stage converts between DIN and yoke, so one regulator handles both fill standards on a trip. Electroless nickel plating and a metal exhaust tee are the durability story.

What the regulator actually gives you

Where it wins and where it costs you

Full review: Atomic Aquatics B2 Regulator

The B2's first stage is a balanced diaphragm with Conshelf-derived architecture, environmentally sealed so that silt, sand and cold water never contact the working mechanism. Balanced means intermediate pressure stays constant regardless of how much gas is left in the cylinder, which is what keeps breathing effort from creeping up on the back half of a dive. Depth rating is 60 m, beyond recreational limits, and electroless nickel plating on the first stage handles saltwater corrosion better than the chrome plating it replaces.

The second stage is balanced and pneumatically assisted, with a metal exhaust tee that both survives harder use than plastic and lowers the effort required to vent an exhale. Controls follow the pattern that works: an adjustable inhalation effort knob and a dive/pre-dive switch that prevents free-flow when the regulator is at the surface and opens the venturi when you need flow at depth. Atomic's super flow whip hose is part of the breathing performance rather than a cosmetic choice.

For travelling divers the convertible DIN and yoke first stage is the feature that earns its keep. Dive operations differ by country and sometimes by boat, and being able to change fitting rather than carry an adapter chain removes a real friction point. Against that: at roughly 1.2 kg it is not featherweight, the second stage is bulkier than minimalist designs, and in some regions the environmental sealing kit is a separate purchase rather than fitted at the factory — confirm before ordering if you dive cold.