First stage materials are chrome-plated Brass and 316 Stainless Steel. All-Titanium second stage construction same as Atomic T2 Atomic Jet Seat high-flow piston first stage Nitrox ready for mixtures up to 40% 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 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.
