It offers smooth dependable air delivery and is built to last. The R105 is teamed with SCUBAPRO’s classic MK2 EVO, the only downstream piston-style first stage with internal components specifically designed to resist freezing in extreme cold-water conditions.

• MK2 EVO classic downstream piston design features a chrome-plated brass body with 1 high pressure & 4 low pressure ports.
• Patented XTIS Extended Thermal Insulating System fully isolates the mechanical elements from the cold increasing freezing resistance without compromising breathing performance
• Oversized piston provides better breathing performance by increasing airflow.
• R105 classic downstream valve design for dependable breathing performance
• Compact casing includes a durable, anti-scratch front cover and reliable metal barrel inside
• Hi-Flow mouthpiece improves airflow as well as mouth comfort, fitting all mouth sizes