A highly functional cold water regulator that provides ease of breathing. The Onyx II is an environmentally sealed version of the Onyx regulator, chosen by ScubaLab testers in 2011. The Onyx II offers the same attractive look and unmatched functionality as the Onyx regulator but is additionally designed for those who dive in colder waters.

The internal structure allows for direct airflow through the first stage, reducing turbulence and thereby providing unparalleled ease of breathing. Our precision, conical high-pressure valves offer much greater reliability and have a longer lifespan than traditional designs, while also providing better response and output at any breathing rate. The braided low-pressure LP hose provides high flow and is highly resistant to abrasion without losing flexibility. A compact exhaust valve, advanced black-satin chrome finishes, and a lightweight design give the Onyx II an impeccable look. An anodized aluminum heat sink on the second stage along with an external diaphragm on the first stage provide better regulator performance in cold water.

Work of breathing at high* demand: 0.95 J/liter *depth 60 m, inlet pressure 750 psi (50 bar), 62.5 RMV (Respiratory Minute Volume)

Like all Zeagle regulators, the Onyx II is factory-ready for diving with nitrox up to 40% O2.

Onyx II DIN 1st Stage

• Equipped with a CWD dry chamber
• Balanced
• 5 LP ports
• 2 HP ports
• Ideal for cold water diving
• Lightweight

2nd Stage

• Downstream valve
• Balanced
• Venturi lever, "dive"/"predive" switch
• Individual breathing resistance adjustment
• New compact profile
• Braided hose length: 76 cm