Poseidon XStream Deep MK3

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$ 532.45



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Poseidon XStream Deep MK3


Poseidon XStream Deep MK3

Poseidon XStream Deep MK3

Poseidon XStream Deep MK3



This is the regulator of choice for any demanding divers that dive with air or trimix with a maximum of 21% oxygen.

Outstanding performance and certified to 200 meters!

The first stage has a built in over pressure valve.

An Xstream Deep regulator complete with a 70 cm / 27,5 inch hose and a second stage.

Approved to depth (m/f) 200/656 (gas dep.)

5 LP and 2 HP-ports

Low WOB - Servo assisted

IP (bar/psi): 8,5 / 123

Air: Yes

Trimix: Yes (max 21% oxygen)

Nitrox 50% No

Oxygen (99,95%): No

Working pressure 300bar: Yes

Built in anti freeze prot.: Yes

O-rings: Nitril/EPDM

US Navy tested: Yes

Oxygen Approved (EN738-1): No

NORSOK approved: Yes

EN250 approved (cold water): Yes

CE Cold water approved: Yes

2nd stage Xstream Deep Mk3

Color Black

Material ASA/TPU, Stainless steel, Brass

Weight (g/lb) 152/0.33

Volume (ml/cuin) 49,5/3.0

Valve technology Upstream

Flowrate (l/cuft per min) 2150/76

Oxygen cleaned No

Servo assisted valve Yes

Overpressure valve built in to the LP hose No

Dismountable w/o tools Yes

Push button on side Yes

Swiveling Yes

Non keyed (no up or down) Yes

Xstream Deep first stage

Color: Black

Technology: Roll diaphragm

Material: Brass

Valve technology: Spheric

Wheel mounted: Side

LP ports 3/8: 5

HP port 7/16: 2

Flow rate (l/min): 5500

O2 clean: No

DIN G5/8: Yes

EN144-3 compatible: No

Separate yoke: Accessory

Zytel HP seat: Yes

Built in overpressure valve: Yes

Anti-freeze protected: Yes

Poseidon XStream Deep MK3 is available in different options and characteristics. Choose the one that fits your needs the best and receive it at home in a few days. In addition, in the online dive store you can find Poseidon XStream Deep MK3 related products. Our selection of Regulators set products are designed to give you complete confidence, no matter of the intensity of the workout or sport activity.


Type of connection:
Hose included:
EAN retail barcodes:

. Regulators

Use the chart below to determine your size. If you´re on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If your measurements for bust and waist correspond to two different suggested sizes, order the size indicated by your bust measurement.

Customer reviews & questions (10)

Product rating 5 / 5

Regulator for ice-cold artic water

This regulator is X-stream! I was satisfied with my old Jetstream, except there was no built in anti freeze protection. Xstream has built in anti freeze protection and the inhale resistance is less than Jetstream. Be careful with the purge button, it can blow your mask off :-)


Being a professional diver and working in a dive store with regulator service, i`ve dived with most of the regulators out there, and there is NO OTHER like this reg! Exceptionally easy to breath, the only one aproved to 200meters and also aproved acording to the Norwegian north sea standard (also the only one), no other reg. is so easy to breathe on and deliver so much air. In any tests, in any temperature or working conditions, nothing else comes even close! In other words, i`ve dived the most, in the worst conditions, and it`s no other regulator i ever wanna use again! To bad, the price reflects the performance, because it`s leagues above anything else!


It s a reason why Gomez used this regulator when he set the world record to 318m!! During tests, it required 0.07 joule to breathe on 150 metres! I do regulator service for a living and the first stage is the key! Like nothing else, its a revolution in design and construction. You barely notice you are breathing on a regulator at all!!

New xstream deep 90

I wanted absolute ease of breathing, a light and comfortable 2nd stage + the performance potential for cold water and depth. I got all of this + excellent sales advice and delivery time. The new x stream (deep 90 attracts attention!

New xsteam deep 90

I wanted absolute ease of breathing, a light and comfortable 2nd stage + the performance potential for cold water and depth. I got all of this + excellent sales advice and delivery time. The new x stream deep 90 attracts attention!

Exceptional performance

I have used this great regulator to a 120 meters in the Red Sea, the performance is exceptional, unbeatable ease of breathing with minimum resistance at depth. I would recommend this reg to any serious deep diver. So if you re a deep dive fanatic, then this is the piece you should be using.


Important information about regulators Poseidon Xstream It was found in the past that the entry of salt water inside the 1st floor due to a bad technique for washing or by use of decompression in bottles with the tap closed, in some cases could cause corrosion of the sphere of high-pressure valve . The corrosion could lead to a malfunction of the 1st floor. In order to improve this aspect and make it resistant to the regulator errors washing, Poseidon has developed a synthetic ball in ruby, which exceeds the supply of steel ball, and is not liable to be oxidized. The new regulators Xstream Deep MK3 and Xstream Duration come already equipped with ruby ball, and other new features.

Great product

Without doubt a good governor. But his elder brother for me the jet is better


i got a mail for scubastore 25mai, that my reg was payd and shiped. 26mai i got it in kirkenes. less than 24hr from spain to nort of norway. thank you scubastore, i will order all my things from you here after.

Simply exceptional regulator/occy combo

I just wanted to add my praise to this brand an the exceptional quality of their regulators. Myself and three friends all bought these (main and occy, of course theyre the same reg to ensure highest quality!) and after adjusting these to our individual preferences these breath as well at 5m as they do @ 50m+. Have dived Atomics, APEX and a number of other deep regulator before and these Poseidons easily match the quality and come in with a much better price. The side vent will change the way you look at regulator (it really is that good) and the faultless quality and workmanship is obvious. A must buy for any serious diver!

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