As105 1St Stage: diaphragm balanced Regulator. Pi: 135 to 145PSI. 5 x 3/8-24 unfit 2B lap ports. 2 x 7/16-20 unfit 2B hp ports. Bright CHROMIUM plated. Yoke or and California as2061 balanced 2nd Stage: right and left hose mounting system. Max working pressure: 150PSI. Airflow: 33 cut. Weight: 197g. With venture lever, adjustable resistance control knob. Octopus without adjustable resistance control knob. High quality Regulator first Stage and second Stage with h9 hose. Comfortable Silicone mouthpiece - large purge button - high performance over-balanced first Stage provides progressively greater intermediate pressure as depth and gas density increase.-Nitrox compatible.