First Stage - XTX DST & 5th port upgrade

Dry Sealed System with swivel turret (DST) and 5th port upgrade, gemonteerd.

5 MP ports, 5 x 3/8 UNF

2 HP ports 7/16 UNF

The first stage - the powerhouse of your regulator - reduces the high pressure air stored in your cylinder to a controllable intermediate pressure of about 9 - 10 BAR. The air then flows along the medium pressure hose to the second stage (demand stage). Apeks manufactures a wide range of first stages to meet the needs of every diver. The DST first stage is one of the world's top 1st stages with proven performance and reliability.

The first stage is of pressure adjustable depth compensated diaphragm design and supplies air at exactly the right pressure. As the diver descends the demand for gas increases and to maintain the supply, the intermediate pressure increases relative to the water depth. In the Dry-Sealed System hydrostatic pressure, acting on the outer sealing diaphragm, is transmitted to the primary diaphragm via the load transmitter. These first stages utilize a unique over-tracking (over-balanced) diaphragm design, where the intermediate pressure supplied to the second stage increases more than traditional balanced models, as the diver descends to greater depths. This increased intermediate pressure compensates for the increased density of your breathing gas by allowing a larger volume of gas to flow through the system on demand. The result is superior breathing performance regardless of depth.The first stage is of pressure adjustable depth compensated diaphragm design and supplies air at exactly the right pressure.

All our first stages are available in both DIN and A clamp versions.