Atomic B2


The B2 gives divers an close alternative to the all-Titanium T2. The signature Atomic breathing performance is nearly identical. The B2 is ergonomically designed to be the world’s most comfortable second stage just like the T2. The key difference is the chrome-plated Brass body of the B2 first stage, which is more economical without sacrificing performance. That’s why the B2 has garnered more awards from independent tests and reviews than any other regulator on the market.

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The B2 is a compact high performance first stage of chrome plated brass and type 316 stainless steel. The B2 is a balanced flow-thru piston design using Atomics jet seat high flow stainless steel piston. Exclusive high-pressure piston seal system is self-lubricating for low friction and low maintenance. The Atomic jet seat system has no sharp edges that can damage the seat over time, like most competitors’ first stages. Instead, Atomic employs a conical seat and blunt end piston. Atomics’ valve seats are precision machined from an extremely strong aerospace specification seat material. This design combination is the most reliable seat system in the industry and enables the seat to go 2-years or 300 dives without service. Diving performance is superior at even low tank pressure. The B2 comes with freeze protection with an optional factory sealed first stage that also prevents contamination such as silt and sand from entering the valve mechanism. The regulator is Nitrox ready for mixtures Up to 40% out-of-the-box. The first-Stage has 2 high-pressure (HP) 7/16″ and 5 low-pressure (LP) 3/8″ ports.

First Stage

  • Atomic B2 Sealed or Unsealed Swivel Regulator First Stage:
  • Nitrox Ready for Mixtures Up to 40% Out-of-the-Box
  • Chrome Plated Brass and 316-Grade Stainless Steel
  • Balanced Flow-Thru Piston Design
  • Atomics Jet Seat High-Flow Piston
  • Exclusive High-Pressure Piston Seal System is Self-Lubricating
  • Self-Lubricating for Low Friction and Low Maintenance
  • No Sharp Edges: Conical Seat and Blunt-End Piston
  • Precision Machined from an Extremely Strong Aerospace Specification Seat Material
  • Most Reliable Seat System in the Industry
  • Seat System: 2-Years or 300 Dives w/o Service
  • 2 High-Pressure (HP) 7/16″ Ports
  • 5 Low-Pressure (LP) 3/8″ Ports
  • LP Port Swivel Turret for Ease of Hose Routing
  • Factory Sealed Freeze Protected Option
  • Seal Prevents Contamination: Silt & Sand from Entering Valve Mechanism


Second Stage:

  • All-Titanium second stage construction same as Atomic T2
  • Patented Atomic Seat Saving Orifice
  • Patented Atomic Automatic Flow Control (AFC)
  • Rapid adjustment knob for manual second stage de-tuning in special situations
  • Polished 316 Stainless Steel Atomic Comfort Swivel
  • A new high-flow second stage case that significantly lowers breathing effort at any depth from shallow water to beyond the limits
  • Dual material second stage cover enables entire front to be used for purge
  • Dual silicone comfort fit mouthpiece with tear-resistant bite tabs
  • 2 year/300 dive service interval
  • Limited Lifetime Warranty – not contingent on proof of service

Additional information

Type of first stage

Balanced flow-thru piston design

Number of HP ports


Number of LP ports

5 on swivel cap

First stage exterior

Chrome Plated Brass

Type of second stage

Pneumatically balanced


Rapid adjustment knob for manual second stage de-tuning in special situations


Unique Diaphragm Activated Vain Automatically Controls the Flow and Venturi-Effect


Dual silicone comfort fit mouthpiece with tear-resistant bite tabs

Nitrox compatible

Yes to 40% O2 when new, out of the box


Sealed 1st Stage, Unsealed 1st Stage




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