Zeagle’s Onyx II Octopus Second Stage is lightweight, compact and comfortable, with diver adjustable inhalation resistance controls, free-flow control, and anodized aluminum heat sink built-in anti-freezing feature. Specific design changes have created a regulator that is resistant to free-flow on the surface yet has incredible smoothness and ease of breathing underwater. This pneumatically balance downstream demand valve second stage regulator is manufactured from flexible and ridged thermoplastic, elastomeric, polymer and silicone rubber. The Zeagle’s Onyx II Octopus second stage comes with a yellow cover and braided hose for easy identification. The hose measures 36″ (91.4cm) with 3/8″ threads and comes with an owner’s manual.