Zeagle Onyx II Regulator style:Yoke Multiple gas definition presets are

Multiple gas definition presets are supported with any combination of oxygen

SV stand for Scupper Valve

Inhalation diaphragm with improved response and tear strength

if you hate to use a snorkel

Pneumatically balanced – consistent performance at any depth

Zeagle Onyx II Regulator style:Yoke Multiple gas definition presets areThis Products Overview Coldwater breathing has never been so effortless. With the same attractive finish and outstanding performance as its predecessor, the Onyx, the Zeagle Onyx II fills the need for those that find themselves in cooler water. Its internal structure allows direct airflow through the 1st stage, providing lower turbulence for outstanding performance. A precision high pressure valve provides reliability and an enhanced service life