Apeks ATX40 Regulator

This is the Apeks ATX40 Scuba Diving Regulator Features: Highly Technical Design Braided 3/8 Flexi-Hose Total Weight: 39.86 oz. (1130 g) Nitrox Ready Up to 40% O2 Out-of-the-Box Suitable for Cold Water Use Below 50°F (10°C) First Stage: APEXS ATX40 DS4: Unique Over-Balanced Diaphragm First Stage Chromed Marine Grade Brass Construction Environmentally Sealed to Keep-Out Contaminates Delicate Internal Parts Not Exposed to Contaminants: Salt, Sand, Chlorine or Pool Acids Requires Less-Maintenance Secondary Environmental Diaphragm Membrane: First Stage Completely-Sealed-Off Dry Ambient Pressure Chamber Second-Layer of Corrosion Resistance and Prevention of Freezing in Cold-Water-Use Four 3/8" UNF (Unified National Fine) Medium Pressure Ports One 7/16" UNF High Pressure Port HP & MP Ports Angled for Optimum Hose Routing Second Stage: APEXS ATX40 Pneumatically-Balanced Second Stage Smooth, Easy Breathing The APEXS ATX40 uses the DS4 first stage. Unique over-balanced, diaphragm design - as the diver descends, the over-balancing feature allows the medium pressure gas in the hose to increase at a rate faster than ambient. This results in superior performance at depth. An environmental dry system keeps water out of the main spring chamber thus preventing ice build-up and keeping silt and contamination out. The chromed marine brass first stage has four medium-pressure (3/8" UNF) ports and one high-pressure port (7/16" UNF). "