Scubapro MK17 EVO 2 First Stage Details:

• Technopolymer plastic barrel with a metal thread and a balanced valve helps save weight and provides a surface that ice crystals can't grab onto when diving in extreme cold water.
• Air-balanced valve smooths out the inhalation effort when diving at varying depths and supply pressures.
• Compact and efficient exhaust tee minimizes exhalation effort
• Air-balanced diaphragm first stage design delivers constant and effortless airflow unaffected by depth, tank pressure, or breathing rate
• Chrome-plated marine grade brass body has sealed internal parts to prevent water and pollutants from fouling the inner mechanism while enhancing cold-water performance.
• Two high pressure, two low pressure and two high-flow LP ports maximize hose routing options