This mid-range regulator is a must-have! Representing our core regulator DNA, the Helix Pro is balanced on first and second stages and benefits from our patented ACD technology. The first stage is fully protected even when the regulator is not under pressure, not to mention a slick new design that will look great for years to come. The Aqualung Helix Pro can be serviced every 2 years.Your Helix Pro Pack includes:- Helix Pro First Stage (available in Yoke or DIN)- Helix Pro Second Stage- Helix Octopus- Pressure Gauge- Regulator Bag