The Atomic Aquatics B2 Second Stage (32" hose, Black) delivers smooth breathing for scuba and diving in underwater environments. Built with all-titanium construction for durability and consistent performance, this second stage continues Atomic's reputation for reliability in demanding settings. Its pneumatically-balanced poppet, high-flow case, and lever design support effortless breathing at any depth or tank pressure. The patented AFC automatic flow control optimizes air delivery, while the soft overmolded Rapid Adjustment Knob enables detuning in specific situations like surf entries or octo use. The titanium seat saving dynamic orifice maintains factory-like tuning and protects against storage damage. The hose features a polished 316 stainless steel Atomic Comfort Swivel with Black PVD coating for enhanced flexibility. A dual-material front cover enables purging from the entire front, and the elliptical exhaust valve reduces exhalation effort as you dive deeper. The dual silicone comfort-fit mouthpiece with tear-resistant bite tabs adds comfort and durability. An optional color kit is available to personalize your regulator system.