Hollis 321 Occy
This octopus is designed on the same platform as the high-performance 221 second stage.
• Patented orthodontic mouthpiece with high-density bite tabs
• Ergonomic A.V.S. (Adjustable Venturi System) dive / pre-dive switch
• High-visibility yellow front cover
• Comes standard with a 36 in / 91 cm yellow hose