Description: Our highest performance first stage diaphragm regulator designed for harsh environments and for the use in polluted environments or cold water. DESIGN & PERFORMANCE Balanced diaphragm design. Cold water dives often require special equipment- generate a high consumption of air and require a prompt delivery of air. The balanced design meets these requirements at all tank pressures. Dry ambient chamber. The diaphragm design prevents the entry of water into the first stage mechanism and enhances a trouble free operation even in the coldest conditions. ENVIRONMENT & ADJUSTMENTS Thermal Insulating System (TIS) and Anti Freeze (AF) System. An additional safety feature to the insulated first stage mechanism in real cold water. COMFORT 4 low pressure ports (2 HFP) & 2 high pressure ports. High Flow Ports (HFP) with a higher performance designed for second stages.