DGX Custom - Poseidon Jetstream Regulator

In Stock
The DGX Custom - Poseidon Jetstream Regulator is an updated version of the classic Poseidon Jetstream regulator on the market for more than 20 years
Poseidon has recently introduced the new Xstream "Black" first stage, which is both oxygen compatible and oxygen clean. The cosmetic difference is the entire regulator is black color rather than silver color. The Black is suitable for all mixtures including Nitrox and Trimix. We are substituting the new Black first stage in all our packages, so you no longer have to choose between the older Deep (which was NOT suitable for use with oxygen rich mixtures) or the older Duration (suitable for Oxygen, but color coded Green and not described as suitable for deep diving.)

DGX Custom - Poseidon Jetstream Regulator

Poseidon Jetstream Regulator
Poseidon Jetstream Regulator
  • Ultra high performance balanced diaphragm design
  • First stage offers 5 LP and 2 HP ports
  • Unique servo assist upstream demand second stage
  • Ambidextrous 2nd stage can be used from left or right
  • Ice Water and Nitrox Ready

The Poseidon Jetstream Mk3 is an updated version of the classic Poseidon Jetstream regulator on the market for more than 20 years. Poseidon now offers a Jetstream second stage using standard low pressure hose fitting together with an Xstream first stage, thus creating an even better performing version. A robust construction and reliable pilot-operated upstream demand valve design make it suitable for the toughest conditions. The second stage is equipped with a +/- flow sensitivity switch, making it popular for sidemount and stage applications.

  • Ultra high-performance Xstream first stage
  • Jetstream equipped with +/- flow sensitivity switch
  • Ambidextrous 2nd stage can be used from left or right
  • DIN first stage fitting with 5 LP and 2 HP ports
  • CE certified to EN250 European cold water standards

This package is assembled by Dive Gear Express using Poseidon first and second stages, together with our flex or rubber hose in your choice of length and also includes a free Delrin DIN Cap.

The Xstream first stage uses a unique synthetic ruby sphere that virtually eliminates high pressure seat wear that is common in knife edge design seating systems. The Xstream first stage also uses a rolling diaphragm design that eliminates any restriction in movement, which creates a smooth transfer of gas from the first stage to the second stage. This rolling diaphragm design further creates a insulating barrier so there is no need for an additional environmental kit. The Xstream has five low pressure standard 3/8-inch UNF ports and two high pressure standard 7/16-inch UNF ports.

The Jetstream second stage uses pilot-operated upstream demand valve technology that also seals the seat without the use of conventional knife edge design seating systems. This servo-assist feature allows for very low inhalation effort and also eliminates any need for a venturi switch or adjustment knob. The second stage is also ambidextrous, allowing both left and right hose routing and breathes equally well in nearly any swimming position while the side mounted exhaust directs the bubbles out of the field of vision.

More Information
SKU PK-781003
Weight 4.500000
Brand Poseidon

Upstream vs Downstream

The demand valves found in scuba second stages can be either upstream or downstream design. In a downstream valve, the moving part of the valve opens in the same direction as the flow of gas and is kept closed by a spring. In an upstream valve, the moving part works against the pressure and opens in the opposite direction as the flow of gas. The upstream design is less likely to experience problems caused by wear and more resistant to free flow, but most scuba second stages are downstream design. If the first stage fails and delivers excessive pressure to the second stage, a downstream valve is forced open resulting in a free flow and rapid loss of breathing gas. With an upstream valve, the result of over pressurization usually means the valve is forced closed. This will stop the free flow but unless the over pressure is relieved it may cause another failure such as a hose rupture or loss of buoyancy control. This means that regulators with upstream second stages must always incorporate an over pressure relief valve (OPV) in their design. The OPV allows the diver to continue to breathe the regulator with a minimal loss of gas.

Historically, Poseidon incorporated the OPV for their upstream second stages in a unique fitting on the end of their low-pressure second stage hose. The special hose was not widely available, particularly in the uncommon lengths preferred by technical divers. In 2008 Poseidon updated their designs (the Mk3 designation) to no longer require a Poseidon-specific low-pressure regulator hose. The OPV is now located in the Poseidon first stage, enabling use of a standard hose of any length and allowing use of a hose swivel or angle adapter if desired. We also offer a M31-1.5mm = 9/16-Inch Adapter w/OPV that will convert any length standard LP regulator hose for use with older (Pre-2008) Poseidon second stages.

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