With the MK17 EVO 2/C370 you have a compact and lightweight regulator system ready to explore dive locales the world over. The new MK17 EVO 2 is a sealed diaphragm first stage with a dry chamber based on a twin spring layout and two HP ports at 15-degree angle to make hose routing easier. The compact C370 offers convenient user controls including a diver-adjustable inhalation effort knob, a coaxial dive/pre-dive lever and a large, easy-to-activate purge button. Sealed balanced diaphragm design makes for the ultimate compact first stage for cold water or contaminated diving conditions. Air-balanced diaphragm delivers consistent and effortless airflow, regardless of depth, tank pressure, or breathing rate. Dry chamber is completely environmentally sealed with a dual diaphragm system that keeps out contaminated water. The rib is designed to enhance heat exchange, making the first stage cold water-proof. Two opposing high-pressure ports positioned on a 15deg angle allow the first stage to be positioned either up or down, plus provide an optimal hose/transmitter layout. S600 second stage&';s air balanced valve smoothes out the inhalation effort at varying depths and supply pressures. Rugged reinforced technopolymer second stage case and front cover with stainless steel frame looks good plus is extremely durable. Metal valve housing (barrel) is able to withstand years of aggressive diving. User controls include a diver-adjustable inhalation effort knob and Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch. Super-flow hose features an oversized bore (larger inside hose diameter) that allows more air to flow on each inhalation. Ultra-comfortable orthodontic mouthpiece is easy to grip yet doesn&';t inhibit airflow. CE certified to EN250A European Standards for all diving conditions, including extreme cold water. Adjustable Second Stage Yes 2nd Stage Design Balanced Weight 2.38 lb 1st Stage Type Diaphram 2nd Stage Series C Series Water Temp Warm, Cold, Temperate Connector Type INT Nitrox Mix Up to 40% HP Ports 2 LP Ports 4 1st Stage Material Chrome-Plated Brass 2nd Stage Material Reinforced Technopolymer Casing 2nd Stage Valve Housing Material Technopolymer WHAT&';S IN THE BOX C370MK17 EVO2Allen Key 4 mmLow Pressure Hose 75 cm Product Resources Read First ManualEnglish. Product Manual Frequently Asked Questions Register Product