For compact comfortable breathing performance in cold or silty water, the MK17 EVO 2/S620 Ti regulator system simply can&';t be beat. 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. Small and lightweight, the S620 Ti delivers excellent performance providing effortless airflow under all dive conditions. 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. S620Ti second stage&';s air balanced valve smoothes out the inhalation effort at varying depths and supply pressures. Rugged reinforced technopolymer case and front cover with stainless steel frame looks good plus is able to withstand years of aggressive diving. Full titanium barrel is rugged, anti-corrosion and lightweight for long-term reliability. Large diaphragm fits inside a more compact second stage casing for maximum breathing sensitivity. User controls include an easy-grip diver-adjustable inhalation effort knob and Venturi-Initiated Vacuum Assist (VIVA) lever. Exclusive compact Hi-Flow mouthpiece is mounted on an enlarged mouthpiece pipe to improve airflow as well as mouth comfort. 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 S 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, Titanium Components, Metal Components 2nd Stage Valve Housing Material Titanium WHAT&';S IN THE BOX 620 TiMK17 EVO 2Allen Key 4 mmLow Pressure Hose 75 cm Product Resources Read First ManualEnglish. Product Manual Frequently Asked Questions Register Product