This is the Scubapro G260 Second Stage Scuba Diving Regulator Features: Balanced Adjustable Second Stage Metal Components for Excellent Cold-Water Resistance Left-Right Hose Attachment Option Ideally Suited for Tech Diving Configurations Durable Corrosion Resistant Chrome Plated Brass Valve Assembly Diver Adjustable Inhalation Effort for Personalized Breathing Control Venturi Initiated Vacuum Assist (VIVA) VIVA: Prevents Free Flow in Cold Water or when Used as Octopus High Flow Exhaust Valve that Reduces Exhalation Effort High Comfort Orthodontic Mouthpiece Highest Performance in Any Conditions 3/8 Threaded Low-Pressure Hose The Scubapro G260 is a new balanced adjustable second stage featuring metal components for excellent cold-water resistance (inlet tube, orifice, inhalation control knob and hose connector). Its high performance makes it a choice for all demanding divers and it will be the natural choice for G250 fans. The new left-right hose attachment option makes it ideally suited for tech diving configurations."