First stage
• Double chrome plated marine brass
• Cold water XTIS (external thermal insulating system) • Improved cold water performance by 30% in waters
down to 2oC
Second stage
• Diver-adjustable inhalation effort
• Diver-adjustable venturi-initiated vacuum assist (VIVA) • High flow exhaust valve
• Ultra comfortable orthodontic mouthpiece
• Full metal valve housing