The Zeagle Onyx II Octo is a lightweight, compact alternate air source engineered for smooth breathing and dependable performance. Its pneumatically balanced downstream valve provides consistent airflow, while adjustable inhalation resistance lets you fine-tune breathing effort. A Dive/Pre-Dive Venturi lever helps control free flow at the surface and delivers responsive performance underwater.

Designed for comfort and demanding dive conditions, the Onyx II features an ergonomic silicone mouthpiece that helps reduce jaw fatigue and an anodized aluminum heat sink for improved cold-water performance. Its low-profile design keeps your equipment streamlined, while the included 36-inch (91.4 cm) hose with standard 3/8-inch threads makes it easy to integrate into most regulator setups.

Key Features:

Lightweight, compact alternate second stage

Pneumatically balanced downstream valve

Adjustable inhalation resistance

Dive/Pre-Dive Venturi control

Anti-freezing anodized aluminum heat sink

Ergonomic silicone mouthpiece

Durable TPU cover and Nylon 12 case

Includes a 36-inch hose with 3/8-inch threads