This is a used Aqua Lung Helix Pro regulator, a balanced-diaphragm design with a sealed first stage that keeps water and particulates out of the internal mechanism. Yoke and DIN versions cover 3,300 psi (232 bar) and 4,350 psi (300 bar) cylinders respectively.
The first stage carries four medium-pressure ports in a T orientation plus two high-pressure ports, routing hoses cleanly to the second stage, octopus, inflator, and drysuit. The pneumatically balanced second stage uses heat exchangers to resist icing, an in-line venturi knob sized for gloved hands, and a Comfo-Bite mouthpiece.
As a used item, this regulator shows cosmetic wear consistent with prior diving. Regulators should be inspected and serviced by a qualified technician before use. Please review the listing photos for the condition of this specific unit.
