Classic downstream piston- The Mark 2 EVO is the best example of bulletproof reliability and trouble-free, minimum maintenance regulators. The classic downstream piston configuration is the simplest mechanism that exists to control the pressure drop from a tank to feed the second stage. The classic downstream valve is the first choice of diving centers and rental facilities worldwide for warm and moderate water temperatures. Classic downstream valves are particularly noted for their legendary safety and reliability. When in use, the downstream valve opens in the same direction as the incoming air flow. To close the valve and stop the air flow, a spring counteracts the force of the incoming air. Therefore, a certain inhalation effort is always required to overcome the spring tension and open the valve.

• Scubapro Mark 2 EVO Fist Stage:
• Flow-By Piston Design
• Marine Grade Chromed Brass Body and Components
• Compact and Lightweight
• Weight: 24.9 oz. (706 g)
• 4 LP Ports
• 1 HP Port
• Fail-Safe Downstream Valve
• EVO: Means Evolution, Revolutionizing Existing Technologies to Higher Performance
• High Performance in Warm and Cold Water
• Meets New EN250-2014 Requirements
• CE Approved for 3360psi (230 bars) in Cold Water Conditions
• Increased Cold Water Efficiency by 50% Over Previous MK2 Regulator
• New Design:
  Proprietary Insulating Coating On-Key Internal Components
  Specific Anti-Freezing Measure
  Patented Finned Cap
  Xtreme Thermal Insulating System (XTIS)
  Ribs of XTIS: Act as Radiator, Increase Surface Area of Heat Transfer
  Warms-Up Internal Parts
• New Parts:
  Bigger Body and Cap Threads
  Insulating Bushing
  Spring Isolation Coating
  Larger Opening On-Cap
  Removable Orifice
• Internal Parts Fully Insulated to Dramatically Improve Cold Water Performance
• Note:LP Hose Not Included