The Poseidon story

The Poseidon company was founded in 1958 in Gothenburg, Sweden, by Dennis Österlund and Ingvar Elvström. It was the first in the world to produce a single hose regulator, the breathing apparatus used by nearly every recreational diver ever since. The original name – Aqua Sports – was changed as the company began to look at new markets for its products.

Today, Poseidon exports to almost every country in the world, bringing the ultimate in diving gear to demanding recreational divers, rescue divers and the military. Manufacturing and research have taken place at the company’s modern factory and test facility on the outskirts of Gothenburg since the mid-80s.

The last few years have marked the latest chapter of the Poseidon story, with new owners, new investment, and the decision to develop a new generation of diving apparatus – the Poseidon MKVI rebreather.

The history of recreational diving
Diving as we know it began with military divers breathing pure oxygen at limited depths. In the 1940s, Jacques Cousteau changed diving forever by introducing the aqualung and skin-diving, and in 1958 Poseidon instigated further dramatic progress with the launch of its revolutionary new regulator.

In the early 80s, American NASA engineer Dr Bill Stone had the idea of applying the principles used for astronauts' breathing apparatus to measure and control the amount of oxygen in a rebreather at changing depths. In 2005 Poseidon created a project team of Swedish and U.S. engineers, under the leadership of Dr. Stone and Jonas Brandt, with a mandate to develop the rebreather concept for recreational divers.

The world’s first recreational rebreather
The Poseidon MKVI is a rebreathing system designed for recreational divers. Exhaled air is purified of CO2, refreshed with a carefully measured amount of oxygen, and recirculated.

The diver breathes warm gas and since the air is retained in the breathing loop, there are no bubbles, which means that natural experience is reinforced. The Poseidon MKVI is designed, made and tested at Poseidon’s Gothenburg factory. For additional safety and quality control, each one is test-dived before sale.

The Poseidon product range
Poseidon has a record of innovation stretching over more than 55 years. Today’s product range includes world-beating regulators, drysuits, ABC equipment, buoyancy compensators, and a host of add-ons and accessories. But whether it’s developing products, creating software, or supporting training programes, at the end of the day, Poseidon stands for just three things.

Quality, safety, and performance

US Navy to Use Only Poseidon Regulators for Cold Water Diving

Poseidon Xstream regulator: After careful evaluation of performance standards of various regulators used by the US Navy, it has been determined that the only regulators that are approved for use by the US Navy for cold water and deep diving are the Poseidon Xstream and Cyklon regulators. Poseidon regulators are being deployed at US Navy bases worldwide and Poseidon is supporting this with a comprehensive training and support program.

Click here to learn more about Poseidon Regulators

29 products

29 products


Q: I have noticed a loud whistling noise coming from the 1st stage on my Xstream regulator, when breathing in it. What is causing this and is it dangerous?
A: A whistling noise can sometimes be heard when the Xstream first stage is pressurized or depressurized. This is due to a resonance frequency which takes place between the ball bearing and the actuating pin. This noise should however not be detectable during low flow rates such as while breathing. The noise has absolutely no effect on the regulator functionality.
In most cases, the noice can be removed by turning the actuating pin a quarter turn. Contact your nearest Poseidon service center and they can help you with this.

Q: How long is the warranty period on a new Poseidon regulator?
A: When you buy a new Poseiodon regulator, it comes with a 24 month warranty. This warranty can be extended with our Life Time Warranty program. You can read more about the terms of our Life Time Warranty program under the Register section of this page. Other products, except those that are regarded as consumables, comes with a 24 month factory warrant.

Q: How often do I need to service my Poseidon regulator?
A: It depends on how much you dive. If you dive 40 - 50 dives a year, we recommend that you service your regulator once every 24 months. If you dive more then that, you should service it once every year. Those that dive every day, should have it serviced at leat once every 6 months or so. Remember that your regulator is life support equipment, designed to keep you alive. If you don't maintain your regulator, it could cause a failure of the equipment.

Q: Can I use a Cyklon, Jetstream or Xstream Deep regulator with nitrox?
A: The Cyklon, jetstream and Xstream Deep are certified and approved with gas mixes that contains a maximum of 21% oxygen. The mentioned regulator models have Nitril o-rings and a silicon based lubricant is used. So it's not suitable for gas mixes that has higher levels of oxygen. If you intend to dive Nitrox, you should use the Xstream Duration, that is approved for gas mixes with a maximum of 99,95% oxygen.

Q: What Poseidon 2nd stages can I combine with what Poseidon Octopus?
A: You can mix Jetstream and Xstream 2nd stages/octopus on the same 1st stage, as these two 2nd stages work with the same intermediate pressure. But you can NOT mix a Jetstream or Xstream 2nd stage with a Cyklon 2nd stage/octopus. The reason is that the Cyklon 2nd stage works on a higher intermediate pressure then the Jetstream and Xstream 2nd stages. Mixing Jetstream/Xstream 2nd stages with a Cyklon 2nd stage can be dangerous!

Q: What´s the intermediate pressure on Poseidon regulators?
A: The Jetstream and Xstream regulators should be set to 8.5 bar (123 psi) intermediate pressure, at full tank pressure. The Cyklon 5000 regulator works at an intermediate pressure of 11,5 bar (166 psi) at 20 bar (290 psi) tank pressure.

Q: Can I use a standard 9/16 LP hose on my Poseidon regulator?
A: If the 1st stage you have, has an over pressure valve built in to it, or has an external over pressure valve attached to a LP port, you can use a standard 9/16 LP hose, if it fits on the 2nd stage connection. For the Jetstream and Xstream 2nd stages, there is an adaptor available, that allows you to connect a standard 9/16 LP hose to the 2nd stage.

Q: If I put a Cyklon 2nd stage on a Triton 1st stage, do I need to modify the Triton 1st stage in any way?
A: The simple answer is no. All you need to to, is to adjust the 1st stage to the correct intermediate pressure that the 2nd stage works at.

Q: Why won´t a LP hose fit in the LP port of my old Cyklon 1st stage?
A: On older Cyklon 1st stages, the standard thread size of all ports were 1/8. Today, all LP ports are 3/8 and all HP ports are 7/16 sized. If you have an older style 1st stage, there are adaptors that be used, so you can attach standard sized hoses to your 1st stage.
Male 1/8 --> female 3/8 thread (Article number 2415)
Male 1/8 --> female 7/16 thread (Article number 2910)

Q: What 1st stages can I use the Atmosphere Full Face Mask with?
A: The Atmosphere FFM is CE approved togeather with the Xstream 1st stage and it's with this 1st stage the mask performs best. If you intend to use the Atmosphere FFM with an other 1st stage, make sure that the correct intermediate pressure is used.

Q: My Atmosphere FFM is vibrating when I breath through it. How can I resolve this?
A: Most likely, you have your FFM connected to a non-Xstream 1st stage or the intermediate pressure on your 1st stage is not correct for the Atmosphere FFM.

Q: Can I put a standard Jetstream 2nd stage on a Atmosphere FFM?
A: The Jetstream PP (the Atmosphere´s 2nd stage) is a modified Jetstream 2nd stage which is constructed to work in conjunction with over-pressure and hold low CO2 levels inside the face mask. Thus you can NOT put a standard jetstream 2nd stage on an Atmosphere FFM. Doing that can cause injury or death.

Q: How can I check if my Besea W50 wing was one of the re-called wings?
A: If you open the zipper on the outer wing bladder, and look at the inner bladder, you will find a small tab, that has some numbers stamped in to it. If you wing has the batch number 5445 stamped in to it, then you have a re-called wing.
That batch, 5445, is the only batch that has been recalled.

Q: Does my Xstreme regulator have an over pressure valve in the first stage?
A: The only Xstream regulators that has a built in over pressure valve, are those that has an article number that starts with 0100, complete regulator, or 0110, just a 1st stage.

Q: There is a problem with my Poseidon gear. What do I do?
A: The first thing you do, is to contact the dealer where you bought the item that’s casing the problem. Explain the problem to them and they will help you out if they can. If the dealer can’t fix the problem, they will in turn contact the local Distributor and if the Distributor can’t fix the problem they will contact Poseidon in Sweden. Keep in mind that you will be required to show proof of purchase and that it has to be a manufacturing- or material error to be covered by our warranty terms. Our warranty terms do not cover items sold used or problems that are related to normal wear & tare or improper handling of the equipment.


Poseidon was first to introduce the single hose regulator and have been manufacturing high-quality regulators for the last 48 years. We have learned to trust our quality and have decided to convey that confidence to our customers!

Regardless of when you purchased your Poseidon regulator, you simply enter our life-time warranty program by servicing your regulator at one of our Authorized Poseidon Service Centers. We guarantee that a Poseidon regulator purchased will be free of defects in material and workmanship under normal scuba use. The Poseidon regulator product warranty is limited to 2 years from the date of your purchase of the Product (”Warranty period”) and extended by an additional 2 years every time your Authorized Poseidon Service Centre register a service of your regulator. Warranty claims are only accepted if you register your regulator on our website and return the product to us or to an Authorized Poseidon Service Center.

How to submit warranty claims under the Poseidon Lifetime Warranty program
Warranty claims have to be submitted to an Authorized Poseidon Service Centre for inspection. If the product qualifies for warranty and proves to be defective for any reason (other then those listed in the limitations section below), Poseidon will repair or replace the Product at its own discretion at no charge. Poseidon reserves the right to replace the claimed Product with a Product of similar function and value in case the Product is no longer available.

Defects not covered by the Poseidon Lifetime Warranty Program
Only defects or damages resulting from a failure in material or workmanship are covered by the Poseidon Life-time Regulator Warranty Program.