This is the Mares Ultra Octopus Scuba Diving Octo Safe Second Stage

Features:

• Designed for Use w/Ultra Adjust Regulators
• Downstream Demand Valve
• VAD+ Performance:
  • Vortex Assist Design (V.A.D.) System
  • 77% Increase Flow Cross Section & Double Curvature for Smoother Flow
  • Optimizing Performance
  • Flow Control (Twin Power) Adjustable Mechanism
  • Delivery Rate of Gas from Natural Breathing to Power Breathing
  • Rotating Adjustment Sleeve on Inlet Achieve VAD+
• Pneumatically Assisted Designed (P.A.D.)
• Adjustable Breathing Knob for Ultimate Breathing Comfort
• Compact and Ergonomic Exhaust Tee
• Soft Hypoallergenic Silicone Mouthpiece
• Mouthpiece Provides Less Jaw Fatigue
• Techno Polymer Construction w/Silicone Mouthpiece
• Hose: 3/8 Thread High Flow Superflex 39.4" (100 cm)
• Bright Yellow Hose Surpassed Tests Required by EN250
• Wide Pivoting Purge Button for Easy Access
• Weight: 12.2 oz. (346g) w/Hose

The Octopus Ultra includes Mares' Twin Power system and, made from techno polymer, it is lightweight. To be used in a set up with the Ultra regulator. The Mares Ultra Octopus Regulator with its vortex assist design (V.A.D.) system: all Mares second stages offer the unique patented VAD system. The air bypass tube conveys air to the mouthpiece creating a swirling vortex with a low-pressure area in the center this keeps the diaphragm down during inhalation, giving very sensitive and easy breathing at all depths. The bypass has undergone a true transformation: 77% increase in flow cross section and double curvature to provide a smoother flow while optimizing performance. For the first time a Mares second stage regulator is equipped with a flow control (Twin Power), managing the delivery rate of gas from natural breathing to power breathing. By rotating the adjustment sleeve on the hose inlet, you can achieve VAD+ performance. "